Say if the tabs are [A][B] [X][Y][Z].
In LTR, it first hides Z, then Y and then X. In RTL it first hides X, Y and then Z.
If you look at the tab order in RTL, which is [Z][Y][X] [B][A], it doesn't make any sense.
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URL: http://translatewiki.net/wiki/Special:Translate/core?uselang=ar