Review Request 127133: DataContainer: Fix slot checks before connect/disconnect

[David Rosca]

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https://git.reviewboard.kde.org/r/127133/
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Review request for Plasma.


Repository: plasma-framework


Description
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Use indexOfSlot instead of indexOfMethod and check for index >= 0.
Also added missing checks for all dataUpdated connects.


Diffs
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  src/plasma/datacontainer.cpp 396bc6d 

Diff: https://git.reviewboard.kde.org/r/127133/diff/


Testing
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Fixes warnings when removing show activity manager applet.


Thanks,

David Rosca

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