OSC 777 is URxvt’s generic escape to send commands to its perl
extensions. The first parameter is the name of the extension, followed
by its arguments.
OSC 777;notify is a, if not well established, at least a fairly well
known escape sequence to request a (desktop) notification. The syntax
is:
\e]777;notify;<title>;<body>\e\\
Neither title nor body is escaped in any way, meaning they should not
contain a ‘;’.
Foot will split title from body at the *first* ‘;’. Any remaining ‘;’
characters are treated as part of ‘body’.
Instead of adding built-in support for the freedesktop notification
specification (which would require us to link against at least dbus),
add a new config option to foot.ini: ‘notify’.
This option specifies the command to execute when a notification is
received. ‘${title}’ and ‘${body}’ can be used anywhere, in any
combination, and as many times as you want, in any of the command
arguments.
The default value is ‘notify-send -a foot -i foot ${title} ${body}’
When calculating the offset into the search string, from where to
start rendering, take into account that the cursor position is
in *characters*, and the glyph-offset is in *cells*.
While doing a scrollback search, the pre-edit string should be
rendered in the search box, not in the grid.
Note that we don’t yet support IME in scrollback search mode. This
patch simply prevents the pre-edit text being rendered in the grid,
in the “background”, while searching.
We may want to be able to enable/disable IME run-time, even though we
have received an ‘enter’ IME event.
This enables us to do that.
Also add functions to enable/disable IME on a per-terminal instance
basis.
A terminal may have multiple seats focusing it, and enabling/disabling
IME in a terminal instance enables/disables IME on all those seats.
Finally, the code to enable IME is simplified; the *only* surface that
can ever receive ‘enter’ IME events is the main grid. All other
surfaces are sub-surfaces, without their own keyboard focus.
