From b69bf4b885cd8d597c29f0af64a3faf2aafa54ce Mon Sep 17 00:00:00 2001
From: John <Johnlrigoni@gmail.com>
Date: Sun, 16 Feb 2025 03:50:42 -0600
Subject: Retro Tapping Re-Write; Key Roll Fix (#23641)

---
 quantum/action.c | 50 ++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 12 deletions(-)

(limited to 'quantum')

diff --git a/quantum/action.c b/quantum/action.c
index 395340d9d7..be85192d25 100644
--- a/quantum/action.c
+++ b/quantum/action.c
@@ -47,7 +47,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 int tp_buttons;
 
 #if defined(RETRO_TAPPING) || defined(RETRO_TAPPING_PER_KEY) || (defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT))
-int retro_tapping_counter = 0;
+bool     retro_tap_primed   = false;
+uint16_t retro_tap_curr_key = 0;
+#    if !(defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT))
+uint8_t retro_tap_curr_mods = 0;
+uint8_t retro_tap_next_mods = 0;
+#    endif
 #endif
 
 #if defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT) && !defined(NO_ACTION_TAPPING)
@@ -77,7 +82,13 @@ void action_exec(keyevent_t event) {
         debug_event(event);
         ac_dprintf("\n");
 #if defined(RETRO_TAPPING) || defined(RETRO_TAPPING_PER_KEY) || (defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT))
-        retro_tapping_counter++;
+        uint16_t event_keycode = get_event_keycode(event, false);
+        if (event.pressed) {
+            retro_tap_primed   = false;
+            retro_tap_curr_key = event_keycode;
+        } else if (retro_tap_curr_key == event_keycode) {
+            retro_tap_primed = true;
+        }
 #endif
     }
 
@@ -531,7 +542,8 @@ void process_action(keyrecord_t *record, action_t action) {
 #    if defined(RETRO_TAPPING) && defined(DUMMY_MOD_NEUTRALIZER_KEYCODE)
                             // Send a dummy keycode to neutralize flashing modifiers
                             // if the key was held and then released with no interruptions.
-                            if (retro_tapping_counter == 2) {
+                            uint16_t ev_kc = get_event_keycode(event, false);
+                            if (retro_tap_primed && retro_tap_curr_key == ev_kc) {
                                 neutralize_flashing_modifiers(get_mods());
                             }
 #    endif
@@ -829,30 +841,44 @@ void process_action(keyrecord_t *record, action_t action) {
 
 #ifndef NO_ACTION_TAPPING
 #    if defined(RETRO_TAPPING) || defined(RETRO_TAPPING_PER_KEY) || (defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT))
-    if (!is_tap_action(action)) {
-        retro_tapping_counter = 0;
-    } else {
+    if (is_tap_action(action)) {
         if (event.pressed) {
             if (tap_count > 0) {
-                retro_tapping_counter = 0;
+                retro_tap_primed = false;
+            } else {
+#        if !(defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT))
+                retro_tap_curr_mods = retro_tap_next_mods;
+                retro_tap_next_mods = get_mods();
+#        endif
             }
         } else {
+            uint16_t event_keycode = get_event_keycode(event, false);
+#        if !(defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT))
+            uint8_t curr_mods = get_mods();
+#        endif
             if (tap_count > 0) {
-                retro_tapping_counter = 0;
-            } else {
+                retro_tap_primed = false;
+            } else if (retro_tap_curr_key == event_keycode) {
                 if (
 #        ifdef RETRO_TAPPING_PER_KEY
-                    get_retro_tapping(get_event_keycode(record->event, false), record) &&
+                    get_retro_tapping(event_keycode, record) &&
 #        endif
-                    retro_tapping_counter == 2) {
+                    retro_tap_primed) {
 #        if defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT)
                     process_auto_shift(action.layer_tap.code, record);
 #        else
+                    register_mods(retro_tap_curr_mods);
+                    wait_ms(TAP_CODE_DELAY);
                     tap_code(action.layer_tap.code);
+                    wait_ms(TAP_CODE_DELAY);
+                    unregister_mods(retro_tap_curr_mods);
 #        endif
                 }
-                retro_tapping_counter = 0;
+                retro_tap_primed = false;
             }
+#        if !(defined(AUTO_SHIFT_ENABLE) && defined(RETRO_SHIFT))
+            retro_tap_next_mods = curr_mods;
+#        endif
         }
     }
 #    endif
-- 
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