When editing a long post in Text mode, clicking on any of the Quicktags buttons may auto-scroll the page

[azaozz]

Happens only in Chrome 38 (recently released) when editor expand is enabled, and only when the caret is somewhere in the middle of the post.

[iseulde]

Looks like this is a Chrome bug. Happens too with editor expand disabled, if you make the textarea a bit longer.

[azaozz]

Yeah, can reproduce it without editor expand too.

[azaozz]

After some quick debugging with @avryl, caused by canvas.focus(); before setting the new caret position (canvas.selectionStart and canvas.selectionEnd).

[azaozz]

In [29884]:

Quicktags: move focusing the editor after inserting content to the end of the code blocks. Fixes a bug in Chrome where both the textarea and the window may auto-scroll to unexpected position on clicking a Quicktags button. Part props avryl, fixes #29944 for trunk.

[krotz]

#30004 was marked as a duplicate.

[hernangonzalez]

#30140 was marked as a duplicate.

[jorbin]

I've tested in chrome 38 and chrome 40.

The above patch ports the change in r29884 over to the 4.0 branch and is ready to be merged.

[nacin]

In 30250:

Quicktags: move focusing the editor after inserting content to the end of the code blocks.

Merges [29884] to the 4.0 branch.

Fixes a bug in Chrome where both the textarea and the window may auto-scroll to unexpected position on clicking a Quicktags button.

props azaozz, avryl.
fixes #29944.