Created attachment 317109 [details]
Simple reproducer program

Summary:

mutter/gnome-shell will fail on a assertion failed when using the attached reproducer.

The reproducer updates the transient relationship between windows whic hseems to confuse mutter focus handling.

Steps to reproduce:

1. Save and build the attached reproducer
   $ gcc -o testdialog-mutter testdialog-mutter.c `pkg-config --libs --cflags gtk+-3.0`
2. Run the reproducer
3. Iconify one of the normal windows, the two dialogs will hide as well
4. close the other remaining window

Actual result:

mutter aborts with:

mutter:ERROR:core/window.c:1355:meta_window_unmanage: assertion failed: (window->display->focus_window != window)

Program received signal SIGABRT, Aborted.


Expected result:

The app closes and mutter survives

Additional data:

I reckon this is not the same as bug 751715 because the patch attached there attachment 306402 [details] [review] has been merged as commit 6c05eb58 and yet I can still crash mutter with the given reproducer.

gdb shows the following:

0  0x00007fffe9fa2a98 in raise () from /lib64/libc.so.6

+ Trace 235806

1350	      meta_topic (META_DEBUG_FOCUS,
1351	                  "Unmanaging window %s which doesn't currently have focus\n",
1352	                  window->desc);
1353	    }
1354	
1355	  g_assert (window->display->focus_window != window);
1356	
1357	  if (window->struts)
1358	    {
1359	      meta_free_gslist_and_elements (window->struts);