Ian MacLeod 720a21ae66
Prevent horizontal transcript selection from triggering autoscroll ( #47137 ) ...
## Why
Dragging horizontally along the top or bottom transcript row could trigger autoscroll, moving the text under the pointer while selecting it.
## What changed
Require vertical pointer movement from the initial press row before selection autoscroll can begin. Remember that movement so a vertical drag can return to its starting edge and still autoscroll, and preserve the original pointer row across wheel scrolling.
## Testing
Extend regression tests and snapshots for horizontal selection at both edges, stable selected text across repeated ticks, wheel scrolling before the first drag, and autoscroll after a vertical drag returns to its starting edge.
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Ian MacLeod
720a21ae66