Takashi Yano via Cygwin-patches 0f7193f4fb Cygwin: pty: Prevent garbage remained in read ahead buffer.
- After commit 29431fcb5b14d4c5ac3b3161a076eb1a208349d9, the issue
  reported in https://cygwin.com/pipermail/cygwin/2020-May/245057.html
  occurs. This is caused by the following mechanism. Cygwin less
  called from non-cygwin git is executed under /dev/cons* rather
  than /dev/pty* because parent git process only inherits pseudo
  console handle. Therefore, less sets ICANON flag for /dev/cons*
  rather than original /dev/pty*. When pty is switched to non-cygwin
  git process, line_edit() is used in fhandler_pty_master::write()
  only to set input_available_event and read ahead buffer is supposed
  to be flushed in accept_input(). However, ICANON flag is not set
  for /dev/pty*, so accept_input() is not called unless newline
  is entered. As a result, the input data remains in the read ahead
  buffer. This patch fixes the issue.
2020-05-31 10:33:55 +02:00
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