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Verified Commit 79f494d6 authored by Fushan Wen's avatar Fushan Wen
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wallpapers/image: fix random order update logic 

In SlideFilterModel, an added/deleted wallpaper is not always the last
one, so `first` and `last` also needs to be taken into account.

`m_randomOrder` stores the row numbers of the source model in a specific order.
 When a new wallpaper is added, the `first` argument is not always equal
to `sourceModel->rowCount()`, and when the condition is not met, all the
existing row numbers in `m_randomOrder` that >= `first` need to be
increased by 1 (or the number of new wallpapers), to make space for new
wallpapers. Vice versa when wallpapers are removed.

CCBUG: 473088
parent 6bd568c2
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