patch 9.0.1080: the "kitty" terminfo entry is not widespread
Problem: The "kitty" terminfo entry is not widespread, resulting in the
kitty terminal not working properly.
Solution: Go back to using "xterm-kitty" and avoid the problems it causes in
another way.
diff --git a/runtime/doc/term.txt b/runtime/doc/term.txt
index 50ba187..146ef47 100644
--- a/runtime/doc/term.txt
+++ b/runtime/doc/term.txt
@@ -306,9 +306,14 @@
Vim this is an indication that the terminal is xterm-compatible and the
builtin xterm termcap entries should be used. Many other terminals depend on
this. However, Kitty is not fully xterm compatible. The author suggested to
-ignore the "xterm-" prefix and use the terminfo entry anyway, but that
-conflicts with what is needed for other terminals. Therefore Vim removes the
-"xterm-" prefix from "xterm-kitty" when it comes from $TERM.
+ignore the "xterm-" prefix and use the terminfo entry anyway, so that is what
+happens now, the builtin xterm termcap entries are not used. However, the
+t_RV is set, otherwise other things would not work, such as automatically
+setting 'ttymouse' to "sgr".
+
+It is not clear why kitty sets $TERM to "xterm-kitty", the terminal isn't
+really xterm compatible. "kitty" would be more appropriate, but a terminfo
+entry with that name is not widespread.
Note that using the kitty keyboard protocol is a separate feature, see
|kitty-keyboard-protocol|.