Dimming screen saver doesn't work properly with front-to-back rendering when using GL

[neo1973]

Bug report

Describe the bug

With front-to-back rendering enabled via advanced setting, the dimming screen saver doesn't dim the highlighted control. This happens only with GL, not GLES.

Expected Behavior

The full application is dimmed.

Actual Behavior

The currently highlighted control stays bright.

Possible Fix

To Reproduce

Steps to reproduce the behavior:

1. Enable front-to-back rendering in advancedsettings.xml

<advancedsettings version="1.0">
  <gui>    
    <fronttobackrendering>true</fronttobackrendering>
    <geometryclear>false</geometryclear>
  </gui>
</advancedsettings>

2. Enable dimming screen saver
3. Highlight a control
4. Wait

Debuglog

The debuglog can be found here: https://paste.kodi.tv/eqekujaqir.kodi

Screenshots

Your Environment

Used Operating system:

• Android

• iOS

• tvOS

• Linux

• macOS

• Windows

• Windows UWP

• Operating system version/name: Arch Linux

• Kodi version: master (36fb885) on Wayland

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