1279748 - Strange Codemirror behaviour at caret

Status: RESOLVED DUPLICATE of bug 1276467

(Core :: Layout, defect)

Description

[Mike Conley (:mconley) (:⚙️)]

I'm able to reproduce this in Review Board (which uses Codemirror for its textarea inputs) and its bug tracker Splat (which uses the same), but the following is pretty straight forward to demonstrate:

STR:

1) Visit http://codemirror.net/
2) In the "This is Codemirror" example editor, double click to select an item
3) Keep clicking around. Eventually, the caret will look like this:

http://www.screencast.com/t/xVCBrdcQw0

ER:

A normal caret

AR:

A weird double-caret thing: http://www.screencast.com/t/xVCBrdcQw0

I used mozregression and I think I've narrowed this down to bug 1275411.

The weirdness is less bad here on Codemirror. It looks much worse on Splat:

http://puu.sh/pex0A/34ab50d5b8.png

Comment 1

[Timothy Nikkel (:tnikkel)]

This sounds like a dupe of bug 1276467, except you got a different regression range.

Comment 2

[David Bolter [:davidb] (NeedInfo me for attention)]

Mike shall we close this as a DUPE? (see above comment)

Comment 3

[Mike Conley (:mconley) (:⚙️)]

Yeah, good call.