Sometimes slow resizing when window isn't visible
foot version 1.5.3-169-g3fa3c58
sway version 1.5-bf9cfe4e
Hi, in sway foot seems to be very slow to resize when its window is hidden behind another, sometimes.
For example on a clear workspace, open two foot instances side-by-side and use the mouse to resize the panes. They both resize fast and everything redraws at a high framerate.
Then open a third foot instance tabbed together with one of the existing panes.
|Horizontal -------- Tab | | ------ f f f
Now one foot instance is hidden but still resizes when you resize the horizontal split. The resizing is very laggy, redrawing maybe 2 times per second.
Verified. It is really slow. I think I know what the problem is, and will put up a PR soon (I hope :)).
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