Scale up folder icon before creating preview overlays
Summary: If a custom folder icon is smaller than the requested preview size `KIO::PreviewJob` returns a pixmap of only that size. E.g. `dolphin` scales this up to its current thumbnail size which results in ugly overlay icons for very small folder icons. If the folder icon is scaled up before creating the overlay icons the overall preview looks much better. CCBUG: 315983 Test Plan: # Set a small custom icon (e.g. 32 px) for a folder containing images # Start dolphin with `Preview` enabled in the parent folder # Zoom thumbnails to e.g. 128 pixels overlay # The overlayed preview icons should not be blurry | Before: | After: | | {F5837958} | {F5837960} | Reviewers: #frameworks, rkflx Reviewed By: rkflx Subscribers: ngraham, rkflx Differential Revision: https://phabricator.kde.org/D12734
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69128259
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