RTL fixes#1201

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alidbc wants to merge 3 commits intofuturepress:masterfrom

Commits on Jun 17, 2021

Fix navigation in pre-paginated RTL double page view
alidbc
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Commits on Jun 18, 2021

RTL navigation fix in continuous mode
alidbc
committed

Commits on Jun 22, 2021

Limiting logic to RTL with negative scroll type
alidbc
committed