Jonas Jenwald 1214c056e9 Slightly optimize spreadMode toggling with ScrollMode.PAGE set (PR 14112 follow-up)
It shouldn't be necessary to iterate through *all* pages when using a non-default `spreadMode`, since we already know which page(s) should become visible.
This code is a left-over from the initial (local) implementation that resulted in PR 14112, however I forgot to clean-up some things such as e.g. this loop.

Also fixes an outdated comment, see PR 14204 which removed the mentioned data-structure.
2021-11-16 15:37:58 +01:00
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