https://bugs.kde.org/show_bug.cgi?id=377670

--- Comment #12 from Xu Zhao <i...@xuzhao.net> ---
(In reply to Marco Martin from comment #11)
> Git commit 948ff63d65d2e645eeb023387600bee52ef4d684 by Marco Martin.
> Committed on 17/03/2017 at 16:47.
> Pushed by mart into branch 'master'.
> 
> when the padding aroun the window changes, update
> 
> Summary:
> update m_visibleRectBeforeGeometryUpdate when the padding
> change signal gets emitted: aurorae updates its shadow
> and postentially shadow size asynchronously after repainting.
> that would make the first addRepaintDuringGeometryUpdates
> when the winow is moved *for the first time* have a wrong
> m_visibleRectBeforeGeometryUpdate that doesn't take into
> account the shadow, leaving some leftover shadow on screen
> 
> Test Plan:
> shadow leftover not reproducible anymore with maui's kwinrc
> replaces D4989
> tested both on master and together D4990, which should go in as well
> 
> Reviewers: #plasma, davidedmundson, graesslin
> 
> Reviewed By: #plasma, graesslin
> 
> Subscribers: plasma-devel, kwin, #kwin
> 
> Tags: #kwin
> 
> Differential Revision: https://phabricator.kde.org/D5078
> 
> M  +4    -0    abstract_client.cpp
> 
> https://commits.kde.org/kwin/948ff63d65d2e645eeb023387600bee52ef4d684

The problem remains in kwin 5.9.4, in which the fix should be contained.
See the screenshot:http://imgur.com/a/zhTJT

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