[NBug] Illegal characters in path.

[richhock]

⚠️ The sections below must be filled in and this text must be removed or the issue will be closed.

Current behaviour

Expected behaviour

Steps to reproduce

Error Details

System.ArgumentException: Illegal characters in path.
   at System.IO.Path.CheckInvalidPathChars(String path, Boolean checkAdditional)
   at System.IO.Path.IsPathRooted(String path)
   at GitCommands.FullPathResolver.Resolve(String path)
   at GitUI.Editor.FileViewer.SetVisibilityDiffContextMenu(Boolean visibleTextFile, String fileName)
   at GitUI.Editor.FileViewer.ResetForDiff(String fileName)
   at GitUI.Editor.FileViewer.<>c__DisplayClass103_0.<ViewPatchAsync>b__0()
   at GitUI.Editor.FileViewer.ShowOrDeferAsync(Int64 contentLength, Func`1 showFunc)
   at GitUI.Editor.FileViewer.<ViewPatchAsync>d__103.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at GitUI.CommandsDialogs.RevisionDiffControl.<ShowSelectedFileDiffAsync>d__35.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at GitUI.CommandsDialogs.RevisionDiffControl.<<DiffFiles_SelectedIndexChanged>b__36_0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at GitUI.ThreadHelper.<>c__DisplayClass13_0.<<FileAndForget>b__0>d.MoveNext()

Additional information

Clicked on a commit pulled from a github wiki with a file whose name contained many symbols.

Environment

• Git Extensions 3.4.3.9999
• Build d4b0f48
• Git 2.20.1.windows.1 (recommended: 2.25.1 or later)
• Microsoft Windows NT 10.0.19041.0
• .NET Framework 4.8.4250.0
• DPI 96dpi (no scaling)

[duplicates-detector-bot]

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[richhock]

I recreated #8571 with more details in the description.
Edit: Added reference