keyboard input in terminal emulators vs X11 apps
I was setting some key bindings in emacs and it puzzled me
that some of those bindings worked in emacs-x but not in emacs-nox.
Then I fired up emacs in a tty, in an X terminal emulator and also a
graphical frame and quoted-insert several key combinations that seem
problematic. This is the result
| | del | backspace | C-backspace | C-M-space |
| linux tty | ^[[3~ | ^? | ^H | ^[ |
| xfce term | ^[[3~ | ^? | ^? | ^[ (^[ + space) |
| gtk emacs | ^D | ^? | | \200 |
(I wasn't able to quote-insert C-backspace in gtk emacs, it simply
killed the word before the point.)
By looking at the table above it can be seen that the xfce terminal
emulator generates a wrong escape sequence when C-backspace is
pressed, which is the same sequence as backspace. (This explains why
this binding didn't work when emacs was running in a terminal
emulator.) The C-M-space sequence is also suspect because it doesn't
match that of the linux tty. Is this a bug in the terminal emulator or
a X.org thing? I don't know.
Also, it appears that gtk emacs sometimes gets completely different
escape sequences, this I don't understand either.
Any comment on this issue will be appreciated.