[Bug 5402] Multiple MFC-based apps crash during non-modal child dialog control creation with active window being zero (Canon PhotoStitch 3.1.13, Flexible Renamer v8.4)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=5402

Anastasius Focht <focht at gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|-unknown                    |user32
            Summary|Canon PhotoStitch 3.1.13    |Multiple MFC-based apps
                   |crashes on startup          |crash during non-modal
                   |                            |child dialog control
                   |                            |creation with active window
                   |                            |being zero (Canon
                   |                            |PhotoStitch 3.1.13,
                   |                            |Flexible Renamer v8.4)

--- Comment #39 from Anastasius Focht <focht at gmx.net> ---
Hello folks,

reviving this old bug again as another app was found which suffers from same
problem: bug 32304 ("Flexible Renamer v8.4 crashes on startup (no active window
after child dialog controls creation)")

Quoting myself:

--- quote ---
For testing purpose I made the top-most parent window which is not a child
window the active window in the non-modal case, after the dialog controls are
created and the default focus assignment is handled.
Basically searching all ancestors until a non-child top window is found which
is not a desktop window (the main app window).

It made the apps from both bugs work.
The change might not be correct but narrows down an area to investigate further
on.
--- quote ---

I tried to limit the impact by adding code only in focus handling.
This might need to be put in larger scope - your task to figure out ;-)

Source:
https://source.winehq.org/git/wine.git/blob/6c5d4cb07e6ddc578cd8f6b359f51c76c6231113:/dlls/user32/dialog.c#l483

--- snip ---
 483 static HWND DIALOG_CreateIndirect( HINSTANCE hInst, LPCVOID dlgTemplate,
 484                             HWND owner, DLGPROC dlgProc, LPARAM param,
 485                             BOOL unicode, BOOL modal )
 486 {
 487     HWND hwnd;
 488     RECT rect;
 489     POINT pos;
...
 691     /* Create controls */
 692 
 693     if (DIALOG_CreateControls32( hwnd, dlgTemplate, &template, hInst,
unicode ))
 694     {
 695         /* Send initialisation messages and set focus */
 696 
 697         if (dlgProc)
 698         {
 699             HWND focus = GetNextDlgTabItem( hwnd, 0, FALSE );
 700             if (!focus) focus = GetNextDlgGroupItem( hwnd, 0, FALSE );
 701             if (SendMessageW( hwnd, WM_INITDIALOG, (WPARAM)focus, param )
&& IsWindow( hwnd ) &&
 702                 ((~template.style & DS_CONTROL) || (template.style &
WS_VISIBLE)))
 703             {
 704                 /* By returning TRUE, app has requested a default focus
assignment.
 705                  * WM_INITDIALOG may have changed the tab order, so find
the first
 706                  * tabstop control again. */
 707                 focus = GetNextDlgTabItem( hwnd, 0, FALSE );
 708                 if (!focus) focus = GetNextDlgGroupItem( hwnd, 0, FALSE );
 709                 if (focus)
 710                     SetFocus( focus );
 711             }
 712         }
 713 
 714         if (template.style & WS_VISIBLE && !(GetWindowLongW( hwnd,
GWL_STYLE ) & WS_VISIBLE))
 715         {
 716            ShowWindow( hwnd, SW_SHOWNORMAL );   /* SW_SHOW doesn't always
work */
 717         }
 718         return hwnd;
 719     }
...
 723 }
--- snip ---

$ wine --version
wine-1.7.45-146-gaf55ae1

Regards

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