[plasmashell] [Bug 524224] After resume from sleep with different monitor configuration, Plasmashell crashed in KConfigGroup::config while trying to look up panel thickness

https://bugs.kde.org/show_bug.cgi?id=524224

Nate Graham <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REPORTED                    |CONFIRMED
                 CC|                            |[email protected]
            Summary|Plasmashell crash in        |After resume from sleep
                   |KConfigGroup::config after  |with different monitor
                   |resume from sleep with      |configuration, Plasmashell
                   |different monitor           |crashed in
                   |configuration               |KConfigGroup::config while
                   |                            |trying to look up panel
                   |                            |thickness
     Ever confirmed|0                           |1

--- Comment #2 from Nate Graham <[email protected]> ---
It's here:

const KConfig *KConfigGroup::config() const
{
    Q_ASSERT_X(isValid(), "KConfigGroup::config", "accessing an invalid
group");

    return d->mOwner;
}

If asserts were on, it would have indicated the group is invalid. The key it
was looking for is "thickness", which is valid, which means it was looking
inside a group named "[PlasmaViews][Panel SOME NUMBER HERE][Defaults]".

So evidently that group wasn't present at the time it was looking.

Groups for panels wouldn't be deleted from the config as a result of
disconnecting screens, so I suspect a timing issue may have caught the config
file in mid-write or something.

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