Review Request: Let Kickoff and SimpleLauncher widgets preserve their settings after menu style change

[Darío Andrés]

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http://reviewboard.kde.org/r/2923/
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Review request for Plasma.


Summary
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Because of the current implementation (kickoff and simplelauncher are two separate applets), switching from one launcher style to another is just a "create a new launcher using the other style and delete me!". This causes all the configuration values to be lost from change to change (including the Icon which is a common setting between the two styles)
In the past I have implemented code to preserve the launcher shortcut; however all the other settings are still lost.

My patch provides a way to save the configuration values (both config() and globalConfig()) from one applet to another; and reload the applet settings to use the new config values.

The code could be a bit hackish (passing KConfigGroups and using copyTo()). 

I also implemented a delayedConfigLoad var, to not load the settings two times (the first, when the applet is created and the init() function is called; and the second one, when the previously stored values are copied...) [Note, this was only done on the SimpleLauncher, as the delayed config load on Kickoff caused the widget to be "iconized" even on the default containment of PlasmoidViewer)

This shouldn't cause noticeable delays or artifacts as reloadConfigValues() is called inmediatly after the applet creation.

Hopefully the APIDOX and the comments are self-explanatory :)

[ If somebody knows how to give a default configuration file; or how to copy the configuration file before the init() call, please tell me and I will improve the patch]


This addresses bug 192836.
    https://bugs.kde.org/show_bug.cgi?id=192836


Diffs
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  svn://anonsvn.kde.org/home/kde/trunk/KDE/kdebase/workspace/plasma/desktop/applets/kickoff/applet/applet.h 1088295 
  svn://anonsvn.kde.org/home/kde/trunk/KDE/kdebase/workspace/plasma/desktop/applets/kickoff/applet/applet.cpp 1088295 
  svn://anonsvn.kde.org/home/kde/trunk/KDE/kdebase/workspace/plasma/desktop/applets/kickoff/simpleapplet/simpleapplet.h 1088295 
  svn://anonsvn.kde.org/home/kde/trunk/KDE/kdebase/workspace/plasma/desktop/applets/kickoff/simpleapplet/simpleapplet.cpp 1088295 

Diff: http://reviewboard.kde.org/r/2923/diff


Testing
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All the config values (from both styles) are preserved after switching back and forward a couple of times.
(The SimpleLauncher constructor may be some review, as I changed the way the applet's args var is handled... but I think it is ok)
Also, someone needs to check if the delayedConfigLoad could cause some issue (I didn't notice anyone)


Thanks,

Darío