[gdb/tui] Delete line buffer when switching to singlekey
Say we're in TUI mode, and type "sun":
...
(gdb) sun
...
After switching to SingleKey mode using C-x s, we have just:
...
sun
...
After typing "d", we get:
...
sun
Undefined command: "sundown". Try "help".
...
The SingleKey "d" is supposed run the "down" command.
Fix this by clearing the readline line buffer when switching to SingleKey
mode.
Tested on x86_64-linux.
PR tui/30522
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30522
Reviewed-By: Tom Tromey <tom@tromey.com>
2 files changed
