Review Request 123273: Image Wallpaper: Don't show duplicates after removing some of the wallpapers

[Antonis Tsiapaliokas]

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https://git.reviewboard.kde.org/r/123273/
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Review request for Plasma.


Bugs: 345914
    https://bugs.kde.org/show_bug.cgi?id=345914


Repository: plasma-workspace


Description
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After removing some local wallpapers, if we click on the apply the remaining wallpapers
are being shown twice. This patch is fixing this issue.

In the bug report, there is an image which is showing up the bug after it has been reproduced.


Diffs
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  wallpapers/image/backgroundlistmodel.cpp 9aaf514 

Diff: https://git.reviewboard.kde.org/r/123273/diff/


Testing
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Thanks,

Antonis Tsiapaliokas

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