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22911ccdcc
This commit introduces a new config option for how to handle shifted arrow keys. In the default mode (SHARROW_APPLICATION), we do what we've always done: Ctrl flips the arrow keys between sending their most usual escape sequences (ESC [ A ... ESC [ D) and sending the 'application cursor keys' sequences (ESC O A ... ESC O D). Whichever of those modes is currently configured, Ctrl+arrow sends the other one. In the new mode (SHARROW_BITMAP), application cursor key mode is unaffected by any shift keys, but the default sequences acquire two numeric arguments. The first argument is 1 (reflecting the fact that a shifted arrow key still notionally moves just 1 character cell); the second is the bitmap (1 for Shift) + (2 for Alt) + (4 for Ctrl), offset by 1. (Except that if _none_ of those modifiers is pressed, both numeric arguments are simply omitted.) The new bitmap mode is what current xterm generates, and also what Windows ConPTY seems to expect. If you start an ordinary Command Prompt and launch into WSL, those are the sequences it will generate for shifted arrow keys; conversely, if you run a Command Prompt within a ConPTY, then these sequences for Ctrl+arrow will have the effect you expect in cmd.exe command-line editing (going backward or forward a word). For that reason, I enable this mode unconditionally when launching Windows pterm. |
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