nano

commit d96f296b8ed6f6297869b8c8dc9bb53ccbd38b95
parent 048ab0ee0be80bd5c0f3af21f9529d11cc6e6914
Author: Benno Schulenberg <bensberg@telfort.nl>
Date:   Fri,  4 Dec 2020 16:35:28 +0100

input: interpret a keystroke as Meta only when an earlier escape was solo

This allows using <Esc> <Esc> <letter> in a macro as an alternative
for <Ctrl+letter>, but it does require that one does not type <Esc>
by accident when recording a macro as it might modify the subsequent
keystroke when the macro is replayed.

This fixes https://savannah.gnu.org/bugs/?58904.

Bug existed since version 3.0, commit ecc9211a.

Diffstat:
M
src/winio.c
 | 
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/winio.c b/src/winio.c
@@ -889,6 +889,7 @@ int convert_to_control(int kbinput)
  * the function keys (F1-F12), and the numeric keypad with NumLock off. */
 int parse_kbinput(WINDOW *win)
 {
+	static bool first_escape_was_alone = FALSE;
 	static bool solitary = FALSE;
 	static int escapes = 0;
 	int keycode;
@@ -905,6 +906,7 @@ int parse_kbinput(WINDOW *win)
 	/* Remember whether an Esc arrived by itself, and increment
 	 * its counter, rolling around on three escapes. */
 	if (keycode == ESC_CODE) {
+		first_escape_was_alone = solitary;
 		solitary = (key_buffer_len == 0);
 		if (digit_count > 0) {
 			digit_count = 0;
@@ -998,7 +1000,7 @@ int parse_kbinput(WINDOW *win)
 		} else if (digit_count == 0) {
 			/* If the second escape did not arrive alone, it is a Meta
 			 * keystroke; otherwise, it is an "Esc Esc control". */
-			if (!solitary) {
+			if (first_escape_was_alone && !solitary) {
 				if (!shifted_metas)
 					keycode = tolower(keycode);
 				meta_key = TRUE;