Decrementing identation does not work on Chromium

[keuv-grvl]

Hi!
I noticed that decrementing indentation using <maj+tab> shortcut works on Firefox 49.0 but not on Chromium 53.0.2785.143 (both on Ubuntu 16.04.1 LTS).
I could not test on Chome, Internet Explorer or Safari.

EDIT:
Decrementing indentation works in both Chromium and Firefox with basic list but not in a list of checkboxes. Example:

• hello1
• hello2
  • hello2.1

hello2.1 is correctly indentated if I use maj+tab

• hello3
• hello4
  • hello4.1

hello4.1 indentation does not change if I use maj+tab

[willdurand]

Hi! Thanks for the bug report.

Indentation is kinda weird on some browsers indeed, especially reverse indentation. Will see what we can do for that.