Andreas 8fdd6c3bf9 Fix bugs in dual-page split (#4983)
If more bugs appear probably better to go back to the main thread and process dual-pages every time a page is shown as it did before

(cherry picked from commit fe373a95a2a6eaf9792a28b4f2b4f394ae40fba4)
2021-05-04 14:49:35 -04:00
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2021-05-04 14:49:35 -04:00
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