patch 8.1.2134: modifier keys are not always recognized
Problem: Modifier keys are not always recognized.
Solution: Handle key codes generated by xterm with modifyOtherKeys set.
Add this to libvterm so we can debug it.
diff --git a/src/getchar.c b/src/getchar.c
index 85cedde..ecd6bdc 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -1733,6 +1733,25 @@
case K_XRIGHT: c = K_RIGHT; break;
}
+ if (!no_reduce_keys)
+ {
+ // A modifier was not used for a mapping, apply it to ASCII
+ // keys.
+ if ((mod_mask & MOD_MASK_CTRL)
+ && ((c >= '`' && c <= 0x7f)
+ || (c >= '@' && c <= '_')))
+ {
+ c &= 0x1f;
+ mod_mask &= ~MOD_MASK_CTRL;
+ }
+ if ((mod_mask & (MOD_MASK_META | MOD_MASK_ALT))
+ && c >= 0 && c <= 127)
+ {
+ c += 0x80;
+ mod_mask &= ~MOD_MASK_META;
+ }
+ }
+
// For a multi-byte character get all the bytes and return the
// converted character.
// Note: This will loop until enough bytes are received!