mono: crash on an attempt to "Copy commit info"

[l-inc]

My current setup includes current GitExtensions' master, mono 5.0.1.1, Cinnamon, Fedora 25, where this bug is also reproducible.

An attempt to "Copy commit info" using the context menu shown above (or the same one from the commit "Diff" window) leads to the following crash on mono:

System.DllNotFoundException: user32
  at (wrapper managed-to-native) GitUI.Editor.RichTextBoxExtension.RichTextBoxXhtmlSupportExtension+NativeMethods:SendMessage (System.Runtime.InteropServices.HandleRef,int,intptr,intptr)
  at GitUI.Editor.RichTextBoxExtension.RichTextBoxXhtmlSupportExtension.BeginUpdate (System.Runtime.InteropServices.HandleRef handleRef) [0x00001] in <e841d986a1f84ab8b0be01a7d62247d9>:0 
  at GitUI.Editor.RichTextBoxExtension.RichTextBoxXhtmlSupportExtension.BeginUpdate (System.Windows.Forms.RichTextBox rtb) [0x0000f] in <e841d986a1f84ab8b0be01a7d62247d9>:0 
  at GitUI.Editor.RichTextBoxExtension.RichTextBoxXhtmlSupportExtension.GetPlaintText (System.Windows.Forms.RichTextBox rtb) [0x00001] in <e841d986a1f84ab8b0be01a7d62247d9>:0 
  at GitUI.CommitInfo.CommitInfo.copyCommitInfoToolStripMenuItem_Click (System.Object sender, System.EventArgs e) [0x00001] in <e841d986a1f84ab8b0be01a7d62247d9>:0 
  at System.Windows.Forms.ToolStripItem.OnClick (System.EventArgs e) [0x00019] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.ToolStripMenuItem.OnClick (System.EventArgs e) [0x00090] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.ToolStripMenuItem.HandleClick (System.Int32 mouse_clicks, System.EventArgs e) [0x00000] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.ToolStripItem.FireEvent (System.EventArgs e, System.Windows.Forms.ToolStripItemEventType met) [0x00054] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.ToolStripItem:FireEvent (System.EventArgs,System.Windows.Forms.ToolStripItemEventType)
  at System.Windows.Forms.ToolStrip.OnMouseUp (System.Windows.Forms.MouseEventArgs mea) [0x00048] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.ToolStripDropDown.OnMouseUp (System.Windows.Forms.MouseEventArgs mea) [0x00000] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.Control.WmLButtonUp (System.Windows.Forms.Message& m) [0x00078] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m) [0x001b4] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.ScrollableControl.WndProc (System.Windows.Forms.Message& m) [0x00000] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.ToolStrip.WndProc (System.Windows.Forms.Message& m) [0x00000] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.ToolStripDropDown.WndProc (System.Windows.Forms.Message& m) [0x00017] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage (System.Windows.Forms.Message& m) [0x00000] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc (System.Windows.Forms.Message& m) [0x0000b] in <298fc9b739c74aebb706be1d082ed5e4>:0 
  at System.Windows.Forms.NativeWindow.WndProc (System.IntPtr hWnd, System.Windows.Forms.Msg msg, System.IntPtr wParam, System.IntPtr lParam) [0x00085] in <298fc9b739c74aebb706be1d082ed5e4>:0 

[RussKie]

It doesn't seem it is possible at all to set data in clipboard in Mono and then paste it to a native app...
e.g. http://mono.1490590.n4.nabble.com/Status-of-Copy-and-Paste-Clipboard-integration-with-OS-X-td1548902.html

I got it working on Mac with the code from here https://stackoverflow.com/questions/28611112/mono-clipboard-fix.
However I don't think this will work on linux, as it appears pbcopy is only available on Mac...

There's also presumably a way to achieve xplat copy/paste functionality via GTK clipboard https://www.medo64.com/2011/01/mono-ubuntu-and-clipboard/
But I couldn't find where to get the GtkClipboard.dll.

On the Mac I couldn't copy text via the native context menu or via Command+C and then paste it in a Mac app at all...

If there is a command to copy text on *nix via command line (the same way as for the Mac) - we can probably fix it. Else - we will need to disable all "copy" context menus on *nix.

[l-inc]

Copying from the commit tree (right click on a commit -> Copy to clipboard -> < any menu item >) works perfectly for me on mono. With respect to this particular issue report, it's just not the best idea to use Win32 API, if GitExtensions is meant to be portable.

[RussKie]

great, it doesn't work on a mac then... sigh
i'll make tweaks and push them for you to test

[l-inc]

Thanks a lot. #3752 does indeed fix the crash.