https://bugs.kde.org/show_bug.cgi?id=464970

            Bug ID: 464970
           Summary: Custom tiling requires Present Windows effect, but
                    there's no notification for that
    Classification: Plasma
           Product: kwin
           Version: 5.26.90
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: Custom Tiling
          Assignee: kwin-bugs-n...@kde.org
          Reporter: ad.liu....@gmail.com
                CC: notm...@gmail.com
  Target Milestone: ---

SUMMARY
If Present Windows effect is disabled, Meta-T silently fails. There're error
messages in the system journal:

Failed to load QUrl("file:///usr/share/kwin/effects/tileseditor/qml/main.qml"):
(file:///usr/share/kwin/effects/tileseditor/qml/main.qml:15:1: module
"org.kde.KWin.Effect.WindowView" is not installed
import org.kde.KWin.Effect.WindowView 1.0
^)
Failed to load QUrl("file:///usr/share/kwin/effects/tileseditor/qml/main.qml"):
(file:///usr/share/kwin/effects/tileseditor/qml/main.qml:15:1: module
"org.kde.KWin.Effect.WindowView" is not installed
import org.kde.KWin.Effect.WindowView 1.0
^)

But the user is unlikely to know what's wrong unless he digs into the journal.

Enabling the effect and reboot fixes this problem.

So it's would be nice if in this situation, instead of silently failing, kwin
shows a notification like "Custom Tiling needs the window effect "Present
Windows" enabled. Please check in systemsettings - blahblah, then reboot.".

STEPS TO REPRODUCE
1. Disable Present Windows.
2. Reboot
3. Press Meta-T

OBSERVED RESULT
Nothing happens.

EXPECTED RESULT
A notification explaining what's wrong and how to fix it.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.26.90
KDE Frameworks Version: 5.102.0
Qt Version: 5.15.8

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