Under the hood
The transcript pane layout gains a new 'dock' region alongside the sidebar
What
The scrollable component that lays out the conversation transcript now accepts new dock, dockWidth, and dockTail settings, in addition to the sidebar it already supported. When calculating how much width is available for the transcript column, it now subtracts the dock's width as well as the sidebar's.
Why
This adds room for a dedicated docked region in the transcript layout, with the surrounding text reflowing to make space for it.
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What content the new dock region displays is not stated in the finding.