- Go to: http://codemirror.net/demo/folding.html
- Move scroll-thumb to the top via mouse
- Click on the gutter on line 17 to fold
- The code folded very quick
- Click again on the gutter on line 17 to unfold
- The first time the unfolding takes a lot of time
Is this the internal CM caching at work or a bug?
Chrome stable Windows 10 64bit