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events: restrict Expose weeding scope to prevent cross-window coalescing #1310

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events: restrict Expose weeding scope to prevent cross-window coalescing #1310

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9 changes: 8 additions & 1 deletion fvwm/events.c
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Original file line number Diff line number Diff line change
Expand Up @@ -271,7 +271,14 @@ static int _pred_weed_accumulate_expose(
static int _pred_weed_is_expose(
Display *display, XEvent *event, XPointer arg)
{
return (event->type == Expose);
if (event->type == Expose)
{
/* Include Expose in weeding (rc & 1) and stop scanning early (rc & 2)
* to avoid coalescing Expose events across different windows.
*/
return (1 /* match */ | 2 /* stop */);
}
return 0;
}

static int _pred_weed_handle_expose(
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