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This fixes an issue where, on a textarea with a lot of text, the cursor would jump when adding a new line. See video in PR for a repro. This is a Chrome bug with scroll anchoring. Refs: https://bugs.chromium.org/p/chromium/issues/detail?id=997266 The fix here disables `overflow-anchor` on the composer textarea. There should be no side effects to this change, as scroll anchoring is likely not needed for the composer textarea element.