Review Request 126961: Fix the infamous Plasma::Applet::Actions crash

[David Edmundson]

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https://git.reviewboard.kde.org/r/126961/
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(Updated Feb. 2, 2016, 3 p.m.)


Review request for Plasma.


Bugs: 351777
    https://bugs.kde.org/show_bug.cgi?id=351777


Repository: plasma-workspace


Description
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We were mixing KScreen and QScreen API badly.

Corona.cpp checks we are requesting a containment for a valid screen
if (screen >= 0 && screen < numScreens()) {

This fails as numScreens() is Qt API based, whereas the signal we're
adding the output for is ShellCorona::addOutput so we have an effective race condition.

BUG: 351777


Diffs (updated)
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  shell/shellcorona.cpp 762e503bf59fe648fb0f5b76a36229aa43c563e5 

Diff: https://git.reviewboard.kde.org/r/126961/diff/


Testing
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Started Plasma on dual screen.

Ideally we need to do more testing before backporting, as that entire codebase is a disgrace.


Thanks,

David Edmundson

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