xterm audit: DEC mode 3 (DECCOLM), 4 (DECSCLM), 40 (132COLS) #870
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Changes:
DECCOLMshould not force the column width on manual resize.DECCOLMwith132COLSdisabled should reset mode 3DECSCLMis tracked but has no effectTodo, not strictly required:
DECCOLMshould resize the window or show a scrollbar if it's too small/big. DECCOLM is so rare and not used in practice that I didn't want to introduce the complexity. In any case, it doesn't affect the terminal state correctness.