Show sticky keys in a different color

Depends on https://github.com/keyboardio/Kaleidoscope-OneShot/pull/18

README.md

@@ -46,6 +46,10 @@ property:
 
 > The color to use for highlighting the modifiers. Defaults to a white color.
 
+### `.sticky_color`
+
+> The color to use for highlighting one-shot modifiers when they are sticky. Defaults to a red color.
+
 ## Dependencies
 
 * [Kaleidoscope-LEDControl](https://github.com/keyboardio/Kaleidoscope-LEDControl)

src/Kaleidoscope/LED-ActiveModColor.cpp

@@ -26,6 +26,8 @@ cRGB ActiveModColorEffect::highlight_color = (cRGB) {
   0xff, 0xff, 0xff
 };
 
+cRGB ActiveModColorEffect::sticky_color = CRGB(0xff, 0x00, 0x00);
+
 void ActiveModColorEffect::begin(void) {
   Kaleidoscope.useLoopHook(loopHook);
 }
@@ -39,7 +41,9 @@ void ActiveModColorEffect::loopHook(bool is_post_clear) {
       Key k = Layer.lookupOnActiveLayer(r, c);
 
       if (::OneShot.isOneShotKey(k)) {
-        if (::OneShot.isActive(k))
+        if (::OneShot.isSticky(k))
+          ::LEDControl.setCrgbAt(r, c, sticky_color);
+        else if (::OneShot.isActive(k))
           ::LEDControl.setCrgbAt(r, c, highlight_color);
         else
           ::LEDControl.refreshAt(r, c);

src/Kaleidoscope/LED-ActiveModColor.h

@@ -29,6 +29,7 @@ class ActiveModColorEffect : public KaleidoscopePlugin {
   void begin(void) final;
 
   static cRGB highlight_color;
+  static cRGB sticky_color;
 
  private:
   static void loopHook(bool is_post_clear);