[Mono-winforms-list] Shadowed window setting ShowInTaskbar

Andy Hume andyhume32 at yahoo.co.uk
Tue Apr 22 11:03:04 EDT 2008

Did you get any further with this, or any response from the list?
I just tried it and the first time it repro-d and I ended up with three
windows, on working, one partially working and one just dead, but all
moveable.  However I have only managed to repro it once since.  I didn't
see any error, but then I couldn't close the duplicate windows, so had
to Ctrl+C out.  CPU was going made I think too!
Could you log it at bugzilla, http://www.mono-project.com/Bugs  That
would be great, and even better if you have a 100% repeatable repro app.


From: mono-winforms-list-bounces at lists.ximian.com
[mailto:mono-winforms-list-bounces at lists.ximian.com] On Behalf Of Josh
Sent: 16 April 2008 15:40
To: mono-winforms-list at lists.ximian.com
Subject: [Mono-winforms-list] Shadowed window setting ShowInTaskbar

Under Linux running mono 1.9_5 when I set ShowInTaskbar = False I get a
shadowed window that just hangs around in the background. The option
works (i.e. it's correctly removed from the Taskbar) but leaves that
annoying window painted on the screen. I should also note that none of
my sub-windows create this shadow, only the main window. Also, this ONLY
seems to be happening under the LINUX version of Mono. I tested under
Windows and I do not have the same issues. Any ideas? Is this more a
dev-list question?

Here is a screenshot:
Here is the error that's produced when I close the form:
X11 Error encountered: 
  Error: BadWindow (invalid Window parameter)
  Request:     12 (0)
  Resource ID: 0x520000F
  Serial:      303
  Hwnd:        Hwnd, Mapped:False ClientWindow:0x520000F,
WholeWindow:0x520000E, Zombie=True, Parent:[<null>]
  Control:     TestMono.Form1, Text: Form1   at
   at System.Windows.Forms.XplatUIX11.HandleError(IntPtr display,
XErrorEvent ByRef error_event)
   at System.Windows.Forms.XplatUIX11.HandleError(IntPtr , XErrorEvent
ByRef )
   at System.Windows.Forms.XplatUIX11.XGetWindowProperty(IntPtr , IntPtr
, IntPtr , IntPtr , IntPtr , Boolean , IntPtr , IntPtr ByRef , Int32
ByRef , IntPtr ByRef , IntPtr ByRef , IntPtr ByRef )
   at System.Windows.Forms.XplatUIX11.XGetWindowProperty(IntPtr , IntPtr
, IntPtr , IntPtr , IntPtr , Boolean , IntPtr , IntPtr ByRef , Int32
ByRef , IntPtr ByRef , IntPtr ByRef , IntPtr ByRef )
   at System.Windows.Forms.XplatUIX11.UpdateWindowState(IntPtr handle)
   at System.Windows.Forms.XplatUIX11.GetWindowState(IntPtr handle)
hwnd, System.Windows.Forms.CreateParams cp)
   at System.Windows.Forms.XplatUIX11.SetWindowStyle(IntPtr handle,
System.Windows.Forms.CreateParams cp)
   at System.Windows.Forms.XplatUI.SetWindowStyle(IntPtr handle,
System.Windows.Forms.CreateParams cp)
   at System.Windows.Forms.Control.UpdateStyles()
   at System.Windows.Forms.Control.CreateHandle()
   at System.Windows.Forms.Form.CreateHandle()
   at System.Windows.Forms.Control.get_Handle()
   at System.Windows.Forms.XplatUIX11.GetMessage(System.Object queue_id,
MSG ByRef msg, IntPtr handle, Int32 wFilterMin, Int32 wFilterMax)
   at System.Windows.Forms.XplatUI.GetMessage(System.Object queue_id,
MSG ByRef msg, IntPtr hWnd, Int32 wFilterMin, Int32 wFilterMax)
   at System.Windows.Forms.Application.RunLoop(Boolean Modal,
System.Windows.Forms.ApplicationContext context)
text context)
   at System.Windows.Forms.Application.Run(System.Windows.Forms.Form
n(System.String[] commandLine)
   at TestMono.My.MyApplication.Main(System.String[] Args)


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