i3 - improved tiling WM

Abort drag when involved window(s) vanish

Patch status: needinfo

Patch by Tony Crisci

Long description:

When in a dragging state induced by `drag_pointer`, abort (rather than
send `DRAG_CANCEL` result) on UnmapNotify.

Fixes an issue that caused i3 to crash when a user is dragging or
resizing a floating window that becomes destroyed.

To apply this patch, use:
curl http://cr.i3wm.org/patch/288/raw.patch | git am

b/src/floating.c

18 
@@ -659,7 +659,6 @@ drag_result_t drag_pointer(Con *con, const xcb_button_press_event_t *event, xcb_
19 
                     DLOG("Unmap-notify, aborting\n");
20 
                     handle_event(type, inside_event);
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                     loop_done = true;
22 
-                    drag_result = DRAG_CANCEL;
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                     break;
24
25 
                 case XCB_KEY_PRESS: