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

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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.
This commit is contained in:
Benno Schulenberg 2020-12-04 16:35:28 +01:00
parent 048ab0ee0b
commit d96f296b8e
1 changed files with 3 additions and 1 deletions
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4
src/winio.c
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@ -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;