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cba27e26cf
Fixes #1099 We previously applied application keypad mode logic (`ESC=` or mode 66) whenever it was active. However, from looking at the behavior of other terminals (xterm and foot) it appears this isn't correct. For xterm, application keypad mode only applies unconditionally if the keyboard mode is VT220 (`-kt vt220`). For modern terminals, application keypad mode is only applied if mode 1035 is disabled. Mode 1035 is the "ignore numpad state with keypad mode" mode. It defaults to true on terminal startup. If this is true, keypads are always encoded in numerical mode. If this is false, the numlock state will be respected.