Emilio Cobos Álvarez 575ef5e7bd Bug 1775797 - Make resizers use frame-relative coordinates. r=TYLin
We no longer use the same code to resize windows and so (bug 1694061),
so keeping screen-relative coordinates is not really needed.

Instead, keep the size of the resized element around and do the math in
frame-relative coordinates, which is better behavior in presence of CSS
transforms.

Differential Revision: https://phabricator.services.mozilla.com/D150058
2022-06-28 08:33:06 +00:00
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