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The number of off-screen pages was too small, resulting in the
possibility of you still being offscreen after the pages loaded,
which could lead to loading more data, which could lead to you still
being offscreen, ad infinitum.

Simply increasing the number of buffer
pages resolves it.

Tested by adding an artificial 1 second delay to
loading a page.

Co-authored-by: Alan Evans <alan@signal.org>

Fixes #10261

Thank you to @Sgn-32 for finding that it can be solved with
StringUtil#isolateBidi()

This removes the deprecated Samsung multi-window support. Actually this
breaks multi-window support on newer Samsung devices. Android supports
multi-window since Android 7.0 and AFAIK Samsung switched to this as
well. There isn't even any reference anymore that mentions these lines
of code as required.