[TextareaAutosize] Temporarily un-observe element when resizing #44540
+22
−14
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Fixes #43718
Demo: https://codesandbox.io/p/sandbox/fix-textarea-ro-error-nslxvr (forked from the original repro)
This was very hard to repro locally, but I believe the "loop" is caused when we change the height of the element while it is being observed.
The fix is to un-observe the element, manipulate the height then re-observe one frame later, instead of manipulating the height one frame later suggested here.