compute_bounds doesn't return any field if the rectangle is empty: its
docs say "If set to true, attempt to determine bounds and write them to
the command's result value as x0, x1, y0, y1 rectangle (default:
false). If the rectangle is empty, not known, or somehow degenerate, it
is not set.". So shrinking mpv as much as possible with a menu open
caused a crash.
This doesn't happen on Xorg because of these lines in video/out/x11_common.c:
// Set minimum height/width to 4 to avoid off-by-one errors.
hint->flags |= PMinSize;
hint->min_width = hint->min_height = 4;
nor on macOS because of
minSize = NSSize(width: 160, height: 90)
in video/out/mac/window.swift.
But this is needed on Wayland and Windows.
Fixes#16682 along with the diff posted there.
Guido Cella
52f2c670d5