Review Request 129086: Update applet alternatives menu entry visibility on demand

[David Rosca]

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This made the Alternatives action visible in toolbox menu.

The problem is that toolbox tries to emit `contextualActionsAboutToShow` on `AppletInterface`, but the connection between `Applet::contextualActionsAboutToShow` and `AppletInterface::contextualActionsAboutToShow` is only one way (signal from `Applet` gets propageted to `AppletInterface`, not the other way).
This never worked (emitting `contextualActionsAboutToShow` from plasmoid), but only this change exposed it.

I have no idea how to fix it, other than adding new method to `AppletInterface` to emit this signal or hacky both-way connection.

- David Rosca


On Oct. 3, 2016, 10:45 a.m., David Edmundson wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/129086/
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> 
> (Updated Oct. 3, 2016, 10:45 a.m.)
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> 
> Review request for KDE Frameworks and Plasma.
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> Repository: plasma-framework
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> Description
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> It's reasnoble to expect people to download an applet just before trying
> to change an existing applet using the alternatives system.
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> Therefore doing the check that any alternative applets exist during applet initialisation time is semantically
> wrong as the option will be prematurely disabled.
> 
> This patch moves it to be verified in contextualActionsAboutToShow.
> 
> This patch also gives a startup performance boost.
> Loading all the applets metadata takes a small amount of time (~50 milliseconds) not really noticable when you're doing it once, but it adds up when we're doing it for a lot of applets in a row.
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> 
> Diffs
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>   src/plasma/applet.cpp 5e278dc69055de0316b49decc08e471081e34b53 
>   src/plasma/private/applet_p.cpp 0f37fe5e3a3c417e079f54b6d8b45fa0051684a5 
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> Diff: https://git.reviewboard.kde.org/r/129086/diff/
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> Testing
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> Right click on kickoff, option was there and worked
> Right click on system tray, no option
> Locked widges, option wasn't there
> Unlocked widgets, option in kickoff came back
> 
> Context menu still appears "instantly"
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> 
> Thanks,
> 
> David Edmundson
> 
>

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