[BUG] Thumbnails glitches if there are many files in the folder

[Aitorbp]

Related Issues

App: https://github.com/owncloud/android/issues/4248

• [x] Added changelog files for the fixed issues in folder changelog/unreleased. More info here

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QA

[jesmrec]

IMO, Calens entries not needed here because there is no change, just a fix over a new feature that already exists in the changelog.

[jesmrec]

Fixed