Microsoft .NET Framework 4.8 Build 3761 发布

原创

dupeng0811 2023-05-17 22:16:57 ©著作权

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Microsoft .NET Framework是用于Windows的新托管代码编程模型。它将强大的功能与新技术结合起来，用于构建具有视觉上引人注目的用户体验的应用程序，实现跨技术边界的无缝通信，并且能支持各种业务流程。Microsoft .NET Framework 4.8 正式版今日发布。

更新列表：

https://github.com/Microsoft/dotnet-framework-early-access/blob/master/release-notes/NET48/dotnet-48-changes.md

下载地址：

https://download.visualstudio.microsoft.com/download/pr/7afca223-55d2-470a-8edc-6a1739ae3252/abd170b4b0ec15ad0222a809b761a036/ndp48-x86-x64-allos-enu.exe

net-framework-banner-logo-600x277.png

.NET Framework release notes describe product improvements grouped by product area. Each change includes a Microsoft-internal VSTS bug ID, the primary binary that was updated and whether the change was a bug or a feature.

ASP.NET

Fix handling of InputAttributes and LabelAttributes for ASP.NET CheckBox control. [643614, System.Web.dll, Bug, Build:3646]
Fixed a perf issue in HttpApplication instances pool in HttpApplicationFactory class. [639421, system.web.dll, Bug, Build:3673]
Fixed NullReferenceException thrown from the page/control with only parameterized constructors with default values when targeting 4.7.2 [635479, System.Web.dll, Bug, Build:3673]
Fixed an issue with ValidationContext.MemberName when using custom DataAnnotation.ValidationAttribute. [563497, System.web.dll, Bug, Build:3694]
Fixed ArgumentOutOfRangeException in MemoryCache when using change monitors with non-existent files east of GMT. [684136, System.Web.dll, Bug, Build:3694]
Fix handling of multi-value HTTP headers that may affect multipart data processing. [684397, System.Web.dll, Bug, Build:3694]
Fixed handling of multi-value HTTP headers that may affect multipart data processing. [726155, System.Web.dll, Bug, Build:3734]
For client applications (winforms, WPF, or console apps, etc) the ASP.NET Client Application Services API’s have been hardened against potentially malicious JSON payloads. [727703, System.Web.dll, Bug, Build:3734]
Fixed an issue introduced in ASP.NET 4.7, where the unexpected removal of a particular type of cache item can result in an orphaned *.delete file that prevents web applications from running. [750653, System.Web.dll, Bug, Build:3734]

BCL

Fixed deserialization of Collections which uses culture aware StringComparer. [566534, mscorlib.dll, Bug, Build:3621]
Fixed System.Runtime.CompilerServices.RuntimeFeature.IsSupported to correctly account for application compatibility quirk settings for the Portable PDB feature introduced in .NET Framework 4.7.1. [571206, mscorlib.dll, Bug, Build:3621]
Fixed the exception by parsing Japanese dates that have the year number exceeding the number of years in that date era. The behavior change will be noticed only if someone tries to parse a date containing some era and year while the year exceeds the last year in that era. [590659, mscorlib.dll, Bug, Build:3621]
By default, elevated processes will not read HKCU for managed COM activation information. [592187, clr.dll, Bug, Build:3621]
Fixed the serialization compatibility issue for CultureAwareComparer class. [621387, mscorlib.dll , Bug, Build:3632]
Upgraded the System.IO.Compression zlib (inside clrcompression.dll) to the latest zlib version 1.2.11 [532490, clrcompression.dll, Bug, Build:3646]
Fixed by reducing memory allocations in hashing with the CAPI classes (SHA256CryptoServiceProvider, et al) [548940, System.Core.dll, Bug, Build:3646]
Fixed by reducing memory allocations in hashing with the CNG classes (SHA256Cng, et al) [548941, System.Core.dll, Bug, Build:3646]
Fixed the issue of System.DateTime returning the wrong time after Windows processes a leap second, by following changes: DateTime and DateTimeOffset will work with the leaps seconds reported by Windows RS5 systems. DateTime.Now and DateTime.UtcNow will always be synchronized with the system time. DateTime and DateTimeOffset will never report the leap second as value 60, instead, it’ll always report it as 59. DateTime and DateTimeOffset operations will continue to work as it used to work, i.e. internally always handle the minutes as 60 seconds which make it compatible with the down levels platforms. [641206, mscorlib.dll, clr.dll, Bug, Build:3646]
Fixed WCF de-serialization failure issue of CultureAwareComparer object. Fixed the issue where Applications using WCF to communicate with web services or applications using data contract serialization directly, were experiencing failures to deserialize the CultureAwareComparer object. [645084, mscorlib.dll, Bug, Build:3646]
Reduced the impact of the "FIPS mode" bit being set in the OS [653796, mscorlib.dll;System.Core.dll, Bug, Build:3646]
Changed default content encryption algorithm of EnvelopedCms to AES. [656518, System.Security.dll, Bug, Build:3646]
Fixed GetECDsaPublicKey to work with brainpool curves. [586452, System.Core.dll, Bug, Build:3673]
Reduced the number of object finalizations that occur as a result of using X509Certificate2 and related types. [654137, mscorlib.dll, System.dll, System.Security.dll, Bug, Build:3673]
Fixed formatting of Japanese date with year 1 (as first year of any era), the date will be formatted using 元 character and not year number “1”. Example of the new formatted date behavior: 平成元年11月21日compared to old formatted date behavior 平成1年11月21日 [670097, mscorlib.dll, Bug, Build:3673]
Fixed default settings used by RsaProtectedConfigurationProvider (use AES instead of 3DES, RSA is now using 2048bit key, OAEP is on by default), fixed encryption with OAEP so that it writes correct metadata. [549418, System.Configuration.dll, Bug, Build:3694]
Add API to obtain certificate thumbprints with a caller-specified digest algorithm. [700365, mscorlib.dll, Feature, Build:3694]
Fixed an IndexOutOfRangeException thrown when asynchronously reading a process output with less than a character's worth of bytes is read at the beginning of a line. [724219, System.dll, Bug, Build:3707]
Mitigate compatibility breaks seen in some System.Data.SqlClient usage scenarios. [727701, System.Configuration.dll, Bug, Build:3707]
Fixed a serialization exception that occurred when a huge amount of objects were serialized with BinaryFormatter. [761576, mscorlib.dll, Bug, Build:3734] Added support for formatting the Japanese first year of era using Gannen 元 when the date pattern not having single quotes around 年. e.g. y年. [777279, mscorlib.dll, Bug, Build:3745]

ClickOnce

Fixed Clickonce UI dialogs on high Dpi machines with scale set to more than 100% for both new and existing applications which scale upto 300%. In the scenario where user wants to see legacy images, there is an opt out switch "Switch.System.Windows.Forms.UseLegacyImages" that can be set to "true" in dfsvc.exe.config file. [389534, Microsoft.Build.Tasks.v4.0.dll, Bug, Build:3621]
Fixed Mage so it can properly update the identity of dependent assemblies in ClickOnce application manifests. [534286, Microsoft.Build.Tasks.v4.0.dll, Bug, Build:3621]
Fixed ClickOnce dialogs (Splash screen, Install progress dialog, Maintenance dialog and Update dialog) have accessibility issues as mentioned in this bug. Fix is for realigning control indices and setting accessible names where it was missing. [541886, Microsoft.Build.Tasks.v4.0.dll, Bug, Build:3621]
Fixed progress bar alignment from Right to Left in Splash Screen and Download progress dialog for ARA & HEB languages for ClickOnce UI. Fixed RTL layout in the ClickOnce dialogs. Individual controls are to be set in RTL layout as this property is not propagated. Set this property explicitly on progress bar control. [552893, Microsoft.Build.Tasks.v4.0.dll, Bug, Build:3621]

CLR

Fixed LoadFrom(String, Byte[], AssemblyHashAlgorithm) works with SHA2 algorithms. [229901, mscorlib.dll, Bug, Build:3621]
Reduced AsyncLocal memory overhead on value change. [470761, mscorlib.dll, Bug, Build:3621]
Improved spin-waits in several synchronization primitives to perform better on Intel Skylake and more recent microarchitectures. [495945, mscorlib.dll, Bug, Build:3621]
Fixed issues where incorrect values are sent to EventListeners. This includes incorrect activity ids on start and stop events and improper EventLevel values. [581072, mscorlib.dll, Bug, Build:3621]
Fixed a potential crash with concurrent calls to a new dynamic method. [581154, mscorlib.dll, Bug, Build:3621]
Fixed a possible deadlock when calling Dispose() on an EventSource. [597221, System.Core.dll, Bug, Build:3621]
The ‘shadowCopyVerifyByTimestamp’ setting is now configurable for individual appdomains, as opposed to being a process wide setting. This helps in situations where you may not be the host process, but want to configure a new appdomain that verifys timestamps when shadow copying. [565570, clr.dll, Bug, Build:3632]
Addressed the issue where the JIT compiler optimized away a call to the CompareExchange intrinsic operation under specific conditions [638227, clrjit.dll, Bug, Build:3646]
CLR COM no longer returns E_INVALIDARG when marshalling a byref SafeArray from an Event Handler. [239541, WindowsBase.dll, Bug, Build:3673]
Fixed a potential hang when a blocking GC is induced in low memory situations [374828, clr.dll, Bug, Build:3673]
If you are using Server GC on a Skylake or later machine, you might notice that clr!SVR::t_join::join is taking a lot more CPU cycles. This is because clr!SVR::t_join::join uses the PAUSE instruction which takes a lot longer on Skylake+. This fix scales down the number of times it’s called when running on Skylake+ machine. [683269, clr.dll, Bug, Build:3673]
Fixed an issue with the GC where frequent LOH under high memory pressure may result in premature OOM errors. [657730, clr.dll, Bug, Build:3694]
Process corrupting exceptions in exception filter (like access violation) now result in aborting the current process. [110375, clr.dll, Bug, Build:3694]
.NET now integrates with antimalware providers to scan assemblies loaded from byte arrays. [576558, clr.dll, Feature, Build:3694]
Fixed an issue with missing Win32 resources in ReadyToRun images. [624174, crossgen.exe, Bug, Build:3694]
Fixed an issue with ngen createpdb where passing in a long output folder could cause a crash. [627712, ngen.exe, Bug, Build:3694]
Fixed a crossgen failure when compiling assemblies with no Win32 resources into ReadyToRun images. [722265, coreclr.dll, Bug, Build:3694]
Fixed ability to handle process corrupted state exceptions stemming from Marshal.PtrToStructure on x86. [381677, clr.dll, Bug, Build:3707]
Fixed intermittent access violation errors when Server GC interacts with type-forwarded value types implemented in mscorlib or other domain-neutral assemblies during garbage collection. [425626, clr.dll, Bug, Build:3707]
Enabled a very obscure and uncommon usage pattern where FX Closure Walks are too expensive in the default domain. Introduced DeferFxClosureWalk (opt-in) switch that when set does the following things: 1) Disable DisableFxClosureWalk switch 2) When in LoaderOptimization.MultiHost, all assemblies are assumed sharable in the default domain and the closure walk is deferred as long as possible. This solution will provide good default domain performance and correctness. [485894, clr.dll, Bug, Build:3707]
Fixed crashes that can occur when NGen'ed facade assemblies are loaded as multidomain-sharable. [602785, clr.dll, Bug, Build:3707]
Improved Monitor’s lock acquisition performance and scalability under a perpetual lock convoy. [602844, clr.dll, Bug, Build:3707]
Fixed an issue that previously caused Ngen to run out of memory every time it executed due to registry corruption. [702519, mscorsvc.dll / mscorsvw.exe, Bug, Build:3707]
Triggering a System.Threading.ThreadAbortException when System.Diagnostics.Debugger.s_triggerThreadAbortExceptionForDebugger is set to true. [732816, mscorlib.dll, Bug, Build:3707]
Fix a crash on COM interop and properly return the hresult for the OOM. [733492, clr.dll, Bug, Build:3707]
Prevents applications from COM activating managed types whose GUIDs mismatch the declared CLSID in the registry" [752205, clr.dll, Bug, Build:3734]
Fixed deadlocks that could occur when loading exception stack traces in out-of-memory conditions. [748860, diasymreader.dll, Bug, Build:3734]
Improved scalability of System.Threading.Timer. Previously System.Threading.Timer had a single global queue that was protected by a single process-wide lock. This can become a scalability problem if Timers are used frequently on multi-CPU machine. This change splits into N per-processor Queues as well as other improvements that improve the performance in a high-scale environment. For compatibility reasons this new code is not activated by default at the present time. It needs to be activated by using .NET Config variable ScalableTimer. [735923, clr.dll, mscorlib.dll, Bug, Build:3734]

<configuration>
  ...
  <runtime>
    <AppContextSwitchOverrides value=""Switch.System.Threading.UseNetCoreTimer=true""/>
  </runtime>
</configuration>

Added an opt-in config option to disable spin-waiting for a critical section when contended. The change can be opted into in an .exe.config file as follows: [754173, clr.dll, Bug, Build:3734]

<configuration>
  ...
  <runtime>
   <Crst_DisableSpinWait enabled=""1""/>
  </runtime>
</configuration>

Fixed the output from the "!u -gcinfo" command in the SOS Debugging Extension [740360, sos.dll, Bug, Build:3734]
Customers who are profiling their .NET Framework application will no longer experience leaks on their ICorProfilerCallback9 COM object as ICorProfilerCallback9 COM object is never freed in the destructor of EEToProfInterfaceImpl instance. [742282, clr.dll, Bug, Build:3734]
Updated ICorProfilerInfo4::GetILToNativeMapping2 to respect the rejitID field and return the appropriate mapping. [748879, clr.dll, Bug, Build:3734]
Fixed storing of instances to the mark stack so that the subsequent code that follows can operate by popping the stack. [750816, clr.dll, clrgc.dll, Bug, Build:3734]
Fixed an issue in the JIT with the compilation of methods that use explicit tailcalls. This feature is never used by C# programs but can impact some F# programs. If you are developing an F# application, you may see incorrect results or program crashes. A workaround is to disable tailcalls or use a debug build of your F# program. [754566, clrjit.dll, Bug, Build:3734]

Networking

Fixed a memory leak issue in HttpWebRequest when communicating with a HTTPS server through a proxy. [484621, System.dll, Bug, Build:3621]
Fixed HTTP Status line parsing to be more tolerant of missing status description text in HTTP responses. [534936, System.dll, Bug, Build:3621]
Fixed a NetworkInformation.NetworkChange deadlock scenario when there is a lock around NetworkChanged listener and user’s callback. [554780, System.Net.NetworkInformation.dll, System.dll, netstandard.dll, Bug, Build:3621]
Fixed a deadlock scenario when ServicePoint.ConnectionLimit is updated and requests are sent at the same time. [528650, System.dll, Bug, Build:3673]
Fix a race condition that would sometimes cause all of the connections to a server to stop sending HTTP requests. [499777, System.dll, Bug, Build:3694]
Added the ability via the config file to specify opt-in performance caching of default credentials for Windows authentication for HTTP and SMTP APIs. [514209, System.dll, Bug, Build:3694]
Added retry timer for PAC file discovery after failure. [567511, System.dll, Bug, Build:3694]
Fixed handling of 1xx interim responses. [711440, System.dll, Bug, Build:3734]
Fixed domain spoofing vulnerability in .NET Framework and .NET Core which causes the meaning of a URI to change when International Domain Name encoding is applied by disallowing certain Unicode characters during the IDN encoding process - CVE-2019-0657 [694688, System.Private.Uri, Bug, Build:3745]

SQL

Fixed the issue that SqlDataReader.ReadAsync() runs synchronously. Now the method runs asynchronously as expected. [594433, System.Data.dll, Bug, Build:3621]
Fixed the issue while using SqlConnection.ConnectionString to set a null or empty connection string, an NRE exception will be thrown by the usage of the API in .Net Framework 4.7.2. [613944, System.Data.dll, Bug, Build:3621]
Fixed the following issue relevant to SQL: while connecting to Azure SQL DB using .NET 4.7.2, using MultipleActiveResultSets=true in the connection string with System.Data.SqlClient.SqlConnection, async query operations sometimes lead to a bad TDS protocol request stream to be sent from the client, causing the Async Query APIs to fail connection string. [624283, System.Data.dll, Bug, Build:3632]
Fixed a bug where SqlClient login may use an infinite timeout due to truncating a small millisecond timeout to zero when converting to seconds. [647908, System.Data.dll, Bug, Build:3646]
This change provides an AppContext switch for making the default value of TransparentNetworkIPResolution false in SqlClient connection strings. [710778, System.Data.dll, Bug, Build:3694]

WCF

Fixed an accessibility problem in WCF Trace Viewer that caused ComboBox controls to be themed incorrectly in High Contrast themes. [424922, SvcTraceViewer.exe, Bug, Build:3621]
Fixed the race-condition that exists in AsyncResult that closes a WaitHandle before Set() is called. When this happens, the process crashes with an ObjectDisposedException. [552736, System.ServiceModel.Internals.dll, Bug, Build:3621]
Fixed race-condition when aborting connections which caused ObjectDisposedException to be thrown in CleanupChannelCollections. [586151, mscorlib.dll, Bug, Build:3621]
Fixed a high lock contention issue when a large number of threads calling WCF serialization logic [570201, System.Runtime.Serialization.dll, Bug, Build:3646]
ServiceHealthBehavior is a new service behavior (IServiceBehavior) for WCF services that exposes a “?health” endpoint. This new behavior allows one to monitor the internal state of their WCF service and obtain specific HTTP response codes during those times that listeners become faulted, throttle capacities are reached, etc. One can extend this behavior to further scope the health of their WCF services to match their own custom business rules and needs. [620852, System.Servicemodel.dll, Feature, Build:3694]
Fixed a System.AccessViolationException due to accessing disposed X509Certificate2 instance in a rare race condition. The fix is to defer the service certificate cleanup to GC. The impacted scenario is WCF NetTcp bindings using reliable sessions with certificate authentication. Customer can opt-in to the fix by adding the follow AppSetting to the config file. Without this AppSetting set to true, existing services won’t be affected by this code change. : <add key=""wcf:deferSslStreamServerCertificateCleanup"" value=""true""/> [695709, System.Servicemodel.dll, Bug, Build:3694]
Fixed a race condition with IIS hosted net.tcp services when the portsharing service is restarted which resulted in the service being unavailable. [695877, System.ServiceModel.WasHosting.dll, Bug, Build:3694]
Fixed broken WCF document links in the tracing log that were broken due to MSDN doc location change. [712450, System.ServiceModel.dll, Bug, Build:3707]
Made some format changes and added lang attribute to WCF service Health page (like http://localhost:83/Service1?health) and%C2%A0and) WCF service metadata page (like http://localhost:83/Service1) to improve accessibility. [777308, System.ServiceModel.dll, Bug, Build:3745]

Windows Forms

Enabled labels are now always rendered using a high contrast text color when a high contrast mode is enabled. This change is effective in applications that are recompiled to target .NET Framework 4.8. [486578, System.Windows.Forms.dll, Bug, Build:3621]
Maximize/Minimize button of new child Form are not scaled well on HDPI devices because of image property set to not to scale. On 100% dpi machines scaling it not required but on high dpi devices, when scaling set to more than 100%, the images set for Maximize/Minimize boxes need to be scaled. [515092, System.Windows.Forms.dll, Bug, Build:3621]
Checkbox height is changed from square to rectangle when scaled. Padding and margins were scaled, thus adding to already scaled height of the checkbox as we were using item height to draw checkbox instead of checkbox height. Earlier these margins/paddings were constants and ignorable pixel sizes, and were not visible. [528418, System.Windows.Forms.dll, Bug, Build:3621]
The new UIA behavior for CheckedListBox control has been introduced: the first checkbox item in the CheckedListBox control is now announced by Narrator when focus moves to the control without any selected item. This change is effective in applications that were recompiled to target .NET Framework 4.8. [533226, System.Windows.Forms.dll, Bug, Build:3621]
The new behavior for disabled link labels has been introduced: link labels' enable/disable state is now provided correctly - disabled links have IsEnabled = false Accessibility Property and read by Narrator as 'Some Link, disabled'. This change is effective in applications that were recompiled to target .NET Framework 4.8. [537224, System.Windows.Forms.dll, Bug, Build:3621]
The new behavior for link label with defined link area has been introduced: link area accessible name is now read by Narrator as full text of the parent link label. This change is effective in applications that were recompiled to target .NET Framework 4.8. [537934, System.Windows.Forms.dll, Bug, Build:3621]
Improved accessibility for the DateTimePicker control. In order for the application to benefit from these changes, the application should be recompiled to target .NET Framework 4.8 or the application should explicitly opt-in into all accessibility app context switches in the app.config file. [543580, System.Windows.Forms.dll, Bug, Build:3621]
An associated label name is now used as an accessible name for DateTimePicker control when AccessibleName property is not set. The default DateTimePicker's AccessibleRole is ComboBox now. These changes are effective in applications that were recompiled to target .Net Framework 4.8. [544791, System.Windows.Forms.dll, Bug, Build:3621]
Fixed issues to add support for UIA live regions to WinForms. Added support for notifications about the Text property changes to the Label class (through UIA Live Regions). [545374, System.Windows.Forms.dll, Bug, Build:3621]
Application Files' and 'Application Directory' label text is truncated on localized OSes. Developers will not be able to see the shortcut information for this control on the UI. This fix helps to resolve that issue and always show the full text of the label . [549024, System.Windows.Forms.dll, Bug, Build:3621]
The new UIA behavior for numeric and domain up-down controls has been introduced: numeric and domain up-down controls without labels (custom UIA name) are announced by Narrator as 'spinners'. This change is effective in applications that were recompiled to target .NET Framework 4.8. [549543, System.Windows.Forms.dll, Bug, Build:3621]
The new UIA behavior for CheckedListBox control has been introduced: an empty CheckedListBox control now has a focus rectangle drawn for a virtual first item when the control becomes focused. This change is effective in applications that were recompiled to target .NET Framework 4.8. [549558, System.Windows.Forms.dll, Bug, Build:3621]
Improved ListView accessibility by enabling showing grey rectangle around the selected ListView item when parent ListView is out if focus. This change is effective in applications that were recompiled to target .NET Framework 4.8. [564762, System.Windows.Forms.dll, Bug, Build:3621]
Fixed VisualStyle property in Winforms, is checking for supported values (by Winforms) and any value that goes outside of this range, Winforms throws an exception. Winforms also checks if the VisualStyle property set is supported by Winforms when it is using this property and does no-op if it is not supported. Underlying native method we use to set visual styles does not care what the value for visualstyle is being passed to it. Making this change will align Winforms code with windows and does not throw exception but still validate supported visual styles when using this property. Removing the validation condition while setting this property. [578093, System.Windows.Forms.dll, Bug, Build:3621]
Fixed the DataGridView's Combobox expand/collapse state accessible for the customers who use assistive technologies. In order for the application to benefit from these changes, the application should be recompiled to target .NET Framework 4.8 or the application should explicitly opt-in into all accessibility app context switches in the app.config file. For example:

In order for an application that targets .NET Framework 4.8 to opt out from this change, use the following combination of switches: <AppContextSwitchOverrides value=""Switch.UseLegacyAccessibilityFeatures=false;Switch.UseLegacyAccessibilityFeatures.2=false;Switch.UseLegacyAccessibilityFeatures.3=true""/>. [574309, System.Windows.Forms.dll, Bug, Build:3621]

Fixed and improved the stability of Live Regions feature by adding LiveSetting property setter check. This feature is available starting with Windows 10, version 1709 (RS3). In order for the application to benefit from these changes, the application should be recompiled to target .NET Framework 4.8 or the application should explicitly opt-in into all accessibility app context switches in the app.config file. For example:

Fixed Winforms application and controls, when enable for ""per-Monitor"" Dpi aware, they are not scaled according to the dpi of the monitor ( or device). Winforms app by default behave like ""System"" Dpi aware. This is causing Winforms applications/controls to be displayed ""blur"" as a result of windows scaling them and in some cases, controls are either not scaled or scaled out of proportionate. Made changes on control level to respond to DPI change event (assuming windows raise this event whenever there is a DPI change) and rescale controls according to the new DPI. [597091, System.Windows.Forms.dll, Bug, Build:3621]
Fixed by adding support for UIA notification event to Label and GroupBox classes. This feature is available starting with Windows 10, version 1709 (RS3). In order for the application to benefit from these changes, the application should be recompiled to target .NET Framework 4.8 or the application should explicitly opt-in into all accessibility app context switches in the app.config file. For example:

Fixed by adding support for the live region feature to the ToolStripStatusLabel class. In order for the application to benefit from these changes, the application should be recompiled to target .NET Framework 4.8 or the application should explicitly opt-in into all accessibility app context switches in the app.config file. For example:

Fixed by improving the accessibility of DataGridView and ListView to make sort direction available via UIA: added exposing sort order and sort column via ItemStatus property and column name. This change is effective in applications that were recompiled to target .NET Framework 4.8. [549288, System.Windows.Forms.dll, Bug, Build:3621]
Fixed by making the forward and backward toolstrip navigation consistent. This feature is available starting with Windows 10, version 1709 (RS3). In order for the application to benefit from these changes, the application should be recompiled to target .NET Framework 4.8 or the application should explicitly opt-in into all accessibility app context switches in the app.config file. For example:
.......