Volume and lightness keys won't work correctly when a menu is open

Submitted by Maxime Bochon

Assigned to Olivier Fourdan @olivier

Link to original bug (#11999)

Description

When a drop-down panel is open, volume and lightness adjustment from keyboard won't work correctly.

By "drop-down panel", I mean: the application menu, a right-click on the desktop, a left-click on a widget icon (wifi, bluetooth, volume), etc.

I tried to describe precisely the problem by:

• listing the actions affected by this bug
• distinguishing standalone buttons from 'Fn' key combinations
• indicating if the action is effective or ignore in such a case
• indicating if a visual feedback is provided when the action is effective

The following tables summarize all this information. The first table describes the normal situation with no bug (when no drop-down panel is open). The latter describes the buggy situation, bugs being marked with a star symbol (*).

+--------------------------------------------------------------+
|         USE CASE 1:  NO DROP-DOWN PANEL IS OPEN              |
+-------------+----------------+------------+------------------+
| action type |     action     | effective? | visual feedback? |
+-------------+----------------+------------+------------------+
| standalone  | mute           |    yes     |       yes        |
|  shortcut   | volume up      |    yes     |       yes        |
|   button    | volume down    |    yes     |       yes        |
+-------------+----------------+------------+------------------+
|             | mute           |    yes     |       yes        |
|    keys     | volume up      |    yes     |       yes        |
|  triggered  | volume down    |    yes     |       yes        |
|     by      | lightness-up   |    yes     |       yes        |
|  'Fn' key   | lightness-down |    yes     |       yes        |
|             | display-off    |    yes     |    irrelevant    |
+-------------+----------------+------------+------------------+

+--------------------------------------------------------------+
|          USE CASE 2:  A DROP-DOWN PANEL IS OPEN              |
+-------------+----------------+------------+------------------+
| action type |     action     | effective? | visual feedback? |
+-------------+----------------+------------+------------------+
| standalone  | mute           |    no*     |       yes        |
|  shortcut   | volume up      |    no*     |       yes        |
|   button    | volume down    |    no*     |       yes        |
+-------------+----------------+------------+------------------+
|             | mute           |    no*     |       no         |
|    keys     | volume up      |    no*     |       no         |
|  triggered  | volume down    |    no*     |       no         |
|     by      | lightness-up   |    yes     |       no*        |
|  'Fn' key   | lightness-down |    yes     |       no*        |
|             | display-off    |    yes     |    irrelevant    |
+-------------+----------------+------------+------------------+

Attachments:

• 'actions-on-keybord.png' shows precisely how actions are triggered on my laptop
• 'action-feedbacks.png' shows what is meant by 'visual feedback'

Version: 4.11.1