achordion: Fix bugs related to the achordion timer and 2345=67

This fixes a rare bug in the achordion timer, by simplifying
the logic. I'm not sure where the math is wrong.  Just that it
is.

Also make 2345=67 more compatible with achordion to close
up the final bug I found in the whole thing.

keyboards/svalboard/keymaps/features/achordion.c

@@ -40,6 +40,7 @@ static bool pressed_another_key_before_release = false;
 
 #ifdef ACHORDION_STREAK
 // Timer for typing streak
+static bool streaking = false;
 static uint16_t streak_timer = 0;
 #else
 // When disabled, is_streak is never true
@@ -66,9 +67,10 @@ static uint8_t achordion_state = STATE_RELEASED;
 #ifdef ACHORDION_STREAK
 static void update_streak_timer(uint16_t keycode, keyrecord_t* record) {
   if (achordion_streak_continue(keycode)) {
-    // We use 0 to represent an unset timer, so `| 1` to force a nonzero value.
-    streak_timer = record->event.time | 1;
+    streaking = true;
+    streak_timer = record->event.time;
   } else {
+    streaking = false;
     streak_timer = 0;
   }
 }
@@ -235,7 +237,7 @@ bool process_achordion(uint16_t keycode, keyrecord_t* record) {
     const uint16_t s_timeout =
         achordion_streak_chord_timeout(tap_hold_keycode, keycode);
     const bool is_streak =
-        streak_timer && s_timeout &&
+        streaking && s_timeout &&
         !timer_expired(record->event.time, (streak_timer + s_timeout));
 #endif
 
@@ -306,9 +308,9 @@ void achordion_task(void) {
 
 #ifdef ACHORDION_STREAK
 #define MAX_STREAK_TIMEOUT 800
-  if (streak_timer &&
+  if (streaking &&
       timer_expired(timer_read(), (streak_timer + MAX_STREAK_TIMEOUT))) {
-    streak_timer = 0;  // Expired.
+    streaking = false;  // Expired.
   }
 #endif
 }

keyboards/svalboard/keymaps/keymap_support.c

@@ -187,11 +187,10 @@ void check_layer_67(void) {
 bool in_mod_tap = false;
 int8_t in_mod_tap_layer = -1;
 bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
-    
+
     // Abort additional processing if userspace code did
     if (!process_record_user(keycode, record)) { return false;}
-
-    if (!global_saved_values.disable_achordion && !process_achordion(keycode, record)) { return false; }
+    if (!in_mod_tap && !global_saved_values.disable_achordion && !process_achordion(keycode, record)) { return false; }
 
     // We are in a mod tap, with a KC_TRANSPARENT, lets make it transparent...
     if (IS_QK_MOD_TAP(keycode) && ((keycode & 0xFF) == KC_TRANSPARENT) &&
@@ -201,19 +200,19 @@ bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
         in_mod_tap_layer = get_highest_layer(layer_state);
         layer_state = layer_state & ~(1 << in_mod_tap_layer);
 
-        action_exec(record->event);
-
         in_mod_tap = true;
 
-        return false;
+        return true;
     }
 
     // Fix things up on the release for the mod_tap case.
     if (!record->event.pressed && in_mod_tap) {
         in_mod_tap = false;
         layer_state = layer_state | (1 << in_mod_tap_layer);
         in_mod_tap_layer = -1;
+        return true;
     }
+
     // If console is enabled, it will print the matrix position and status of each key pressed
 #ifdef CONSOLE_ENABLE
     uprintf("KL: kc: 0x%04X, col: %2u, row: %2u, pressed: %u, time: %5u, int: %u, count: %u\n", keycode, record->event.key.col, record->event.key.row, record->event.pressed, record->event.time, record->tap.interrupted, record->tap.count);