Animated GIF worth thousands of words: https://cloudup.com/iiha76VfAIh. Note how the cursor is lagging. Originally reported by https://twitter.com/toolmantim.
<rdar://problem/21666399>
<rdar://problem/21666642>
This is caused by the beginning of line checkbox placeholder marker we add to lines. We are either slow at removing it, or CodeMirror is slow at honoring our removal request.
Created attachment 256155 [details] Patch
Comment on attachment 256155 [details] Patch Clearing flags on attachment: 256155 Committed r186286: <http://trac.webkit.org/changeset/186286>
All reviewed patches have been landed. Closing bug.
Finally tested this — works like a charm!