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add -p: disable stdin buffering when interactive.singlekey is set
The builtin "add -p" reads the key "F2" as three separate keys "^[", "O" and "Q". The "Q" causes it to quit which is probably not what the user was expecting. This is because it uses poll() to check for pending input when reading escape sequences but reads the input with getchar() which is buffered by default and so hoovers up all the pending input leading poll() think there isn't anything pending. Fix this by calling setbuf() to disable input buffering if interactive.singlekey is set. Looking at the comment above mingw_getchar() in terminal.c I wonder if that function is papering over this bug and could be removed. Unfortunately I don't have access to windows to test that. Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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