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altTab: Correct selection with arrows and scrolling using RTL

Leleat requested to merge Leleat/gnome-shell:altTab-rtl into master

The switcherPopups use _next() and _previous() to get the items in the text direction. I. e. with LTR _next() gets the right item; on RTL gets the left item. This doesn't work well with RTL when using the arrow keys or the scroll wheel since the text direction doesn't matter in those cases. Pressing Left Arrow should still move left regardless of text direction. So add the option to _next/_previous() (and the corresponding window methods for the app switcher) to force a specific direction when using input (arrow keys & scroll wheel), which 'ignores' the text direction.

Fixes #2547 (closed).

2547 mentions

RTL behavior should be:

  • scrolling up move to the left
  • scrolling down move to the right

That's the same as LTR, is that how it should be?

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