Revert "Fix #2072 (only resize a tab if the size changed since the last display)"
This reverts commit b46f0f5e. Conflicts: src/tabs/muclisttab.py Doing this made the unresized elements refresh in the old subwins, causing glitches and weirdness. And anyway, the only problematic element is the TextWin (rebuilding all the lines of a buffer is expensive), but it already checks if the width changed.
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