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Fixes #2815 This commit changes our autoscroll strategy for cursors significantly. Originally, we were autoscrolling whenever the cursor's marker changed positions. This worked well, except we didn't end up autoscrolling when the user *attempted* to move the cursor to an invalid position, such as moving down at the end of the buffer, due to the fact that the marker wouldn't change. Then, we moved to always requesting an autoscroll whenever a position change was requested via Cursor::changePosition. This missed out on moving the cursor when inserting text, so we then also added an explicit autoscroll call when inserting text. This had the problem of not autoscrolling due to undo. So finally, this solution combines explicit autoscroll in ::changePosition to capture intent, as well as implicit autoscrolling whenever the cursor's marker position changes due to a textual change in the buffer. This captures undo/redo correctly.
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