Add missing RGB_MODE_TWINKLE / RGB_M_TW keycodes (#11935)

* Add missing RGB_MODE_TWINKLE / RGB_M_TW keycodes

* Better comment

Co-authored-by: Ryan <fauxpark@gmail.com>

Co-authored-by: Ryan <fauxpark@gmail.com>

docs/feature_rgblight.md

@@ -74,6 +74,7 @@ Changing the **Value** sets the overall brightness.<br>
 |`RGB_MODE_XMAS`    |`RGB_M_X` |Christmas animation mode                                            |
 |`RGB_MODE_GRADIENT`|`RGB_M_G` |Static gradient animation mode                                      |
 |`RGB_MODE_RGBTEST` |`RGB_M_T` |Red, Green, Blue test animation mode                                |
+|`RGB_MODE_TWINKLE` |`RGB_M_TW`|Twinkle animation mode                                              |
 
 !> By default, if you have both the RGB Light and the [RGB Matrix](feature_rgb_matrix.md) feature enabled, these keycodes will work for both features, at the same time. You can disable the keycode functionality by defining the `*_DISABLE_KEYCODES` option for the specific feature.
 

quantum/process_keycode/process_rgb.c

@@ -205,6 +205,11 @@ bool process_rgb(const uint16_t keycode, const keyrecord_t *record) {
             case RGB_MODE_RGBTEST:
 #if defined(RGBLIGHT_ENABLE) && !defined(RGBLIGHT_DISABLE_KEYCODES) && defined(RGBLIGHT_EFFECT_RGB_TEST)
                 rgblight_mode(RGBLIGHT_MODE_RGB_TEST);
+#endif
+                return false;
+            case RGB_MODE_TWINKLE:
+#if defined(RGBLIGHT_ENABLE) && !defined(RGBLIGHT_DISABLE_KEYCODES) && defined(RGBLIGHT_EFFECT_TWINKLE)
+                handleKeycodeRGBMode(RGBLIGHT_MODE_TWINKLE, RGBLIGHT_MODE_TWINKLE_end);
 #endif
                 return false;
         }

quantum/quantum_keycodes.h

@@ -511,6 +511,9 @@ enum quantum_keycodes {
     ONESHOT_DISABLE,
     ONESHOT_TOGGLE,
 
+    // RGB underglow/matrix (continued)
+    RGB_MODE_TWINKLE,
+
     // Start of custom keycode range for keyboards and keymaps - always leave at the end
     SAFE_RANGE
 };
@@ -654,6 +657,7 @@ enum quantum_keycodes {
 #define RGB_M_X RGB_MODE_XMAS
 #define RGB_M_G RGB_MODE_GRADIENT
 #define RGB_M_T RGB_MODE_RGBTEST
+#define RGB_M_TW RGB_MODE_TWINKLE
 
 // Magic aliases
 #define CL_SWAP MAGIC_SWAP_CONTROL_CAPSLOCK