[Bug]: scroll jump in fullscreen about opencomic HOT 4 OPEN

I have been able to reproduce the bug a few times, after making these changes e12383a it has not appeared again, although since it is an inconsistent bug, I am not entirely sure that it has been solved.

I also fix the "next chapter" bug reported here #230 b013431

Build: https://mega.nz/file/vLJA1IJb#HEoO5GoXy6KiBCQB3jRWHtavhAEt6xU5oNLMgWFVXzM

• Scroll jump in fullscreen using alt+tab (Windows) e12383a
• Errors when fast pressing shortcuts keys when reading is loading b013431

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I am not entirely sure that it has been solved

Well, looks like like it's mostly fixed. It doesn't jump like it was and I only got one random jump and couldn't reproduce. There is small movements sometimes, but it doesn't bother if you don't specifically look for them.

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I have been testing a little more and so far it has only appeared after changing the margin values, I have made some changes to fix in this case and also the small movements bf0946e

Build: https://mega.nz/file/vTgjwK5K#cZByTcMcJzn7-h5GHnmlL4niJ157Wo-uHV0XwBRxl4c

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