Review Request 129204: Add toggle signal for applet de-/activation in order to fix non-closing launchers on Meta (and also on Active Screenedges)

[Roman Gilg]

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https://git.reviewboard.kde.org/r/129204/
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Review request for Plasma.


Bugs: 367685
    http://bugs.kde.org/show_bug.cgi?id=367685


Repository: plasma-framework


Description
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# The new Meta-key support for launcher opening doesn't work for closing at the moment. My analysis of the problem was as follows:

- KWin calls Applet::activated() over DBus
- Applet::activated() is connected to AppletInterface::activated()
- AppletInterface::activated() is connected to setExpanded(true), which can only expand the launcher, but not the other way around

# Q: Why is Alt+F1 working though?
A: The launchers seem to inherit the reimplementation function Dialog::focusOutEvent(..). Atleast when you delete line 1094, which sets the visibility to false, it's not working anymore. Alt+F1 triggers the focusOutEvent(..) as a global shortcut.

# Q: Why is it working with the Dashboard though?
A: The dashboard doesn't use the expanded feature of the plasmoid, but rather connects directly to the AppletInterface::activated() signal and shows/hides an independent widget by getting triggered on it.

# Solution:
Create new toggled() signal chain in KWin, Applet, AppletInterface, which tests the current expanded state and setting it afterwards accordingly to its opposite. This diff here in plasma-framework is the first one, the others are dependent on. The others are on Phabricator:

- kwin: soon
- plasma-workspace: soon
- plasma-desktop: soon

# Need feedback regarding:

- Should we remove the activated() signal chain? Is it used somewhere else than KWin?
- Could a race condition occur if we deexpand the applet while at the same time setting the visibility to false through focusOutEvent()? My tests until now don't suggest it, but I haven't yet looked into it extensively.


Diffs
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  src/plasma/applet.h 89498ea 
  src/scriptengines/qml/plasmoid/appletinterface.h a1e2cd7 
  src/scriptengines/qml/plasmoid/appletinterface.cpp 1cd6934 

Diff: https://git.reviewboard.kde.org/r/129204/diff/


Testing
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Thanks,

Roman Gilg

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