[Mono-bugs] [Bug 637177] New: InvalidOperationException in ToolStrip painting

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https://bugzilla.novell.com/show_bug.cgi?id=637177

https://bugzilla.novell.com/show_bug.cgi?id=637177#c0


           Summary: InvalidOperationException in ToolStrip painting
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: x86
        OS/Version: Other
            Status: NEW
          Severity: Critical
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: ciaran at ciarang.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.8)
Gecko/20100722 Firefox/3.6.8

The following exception occurs, apparently when trying to paint a toolstrip. In
the right circumstances, it happens very frequently, or even every time:

System.InvalidOperationException: List has changed.
  at System.Collections.ArrayList+SimpleEnumerator.MoveNext () [0x00000]
  at System.Windows.Forms.ToolStrip.OnPaint
(System.Windows.Forms.PaintEventArgs e) [0x00000]
  at System.Windows.Forms.Control.WmPaint (System.Windows.Forms.Message& m)
[0x00000]
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m)
[0x00000]
  at System.Windows.Forms.ScrollableControl.WndProc
(System.Windows.Forms.Message& m) [0x00000]
  at System.Windows.Forms.ToolStrip.WndProc (System.Windows.Forms.Message& m)
[0x00000]
  at System.Windows.Forms.StatusStrip.WndProc (System.Windows.Forms.Message& m)
[0x00000]
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage
(System.Windows.Forms.Message& m) [0x00000]
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc
(System.Windows.Forms.Message& m) [0x00000]
  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, IntPtr
wParam, IntPtr lParam) [0x00000]


Reproducible: Sometimes

Steps to Reproduce:
This happens most frequently on a slow machine. I can reproduce it every time
on a 750MHz Pentium III. It happens hardly ever on a 'modern' machine.

1. Run a WinForms app that has a menu (ToolStrip)
2. Use the mouse to select an item from the menu (In my test case,
&Volume->Ma&x). No problem.
3. Do the same, but using the keyboard (i.e. Alt-V, then X - result: crash of
application (nothing I can do to catch this either), with the exception message
thrown above.

The application isn't doing anything 'odd' or unusual. It's just a standard
toolstrip. (And it's never modified at runtime). This never happens running the
same binary under .NET.

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