During initial discussions with accessibility team, we decided to remove the per-textarea scroll bars in favor of allowing the textareas to grow and shrink dynamically, with the content. In the horizontal orientation, the textareas are expected to maintain a uniform height between the two, scaling to the maximum content size of either side. in vertical orientation, both textareas should only grow as much as they need to fit their own content. The single scroll bar remains only for the page itself.
Bug 2016538 Comment 1 Edit History
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During initial discussions with accessibility team, we decided to remove the per-textarea scroll bars in favor of allowing the textareas to grow and shrink dynamically, with the content. In the horizontal orientation, the textareas are expected to maintain a uniform height between the two, scaling to the maximum content size of either side. in vertical orientation, both textareas should only grow as much as they need to fit their own content. The single scroll bar remains only for the page itself. We also decided to remove the textarea resizers with this behavior, even though I think some of the Figma design still show them.