Add inactive_color property

doc/plugin/LED-Stalker.md

@@ -46,6 +46,12 @@ properties:
 >
 > Defaults to 50.
 
+### `.inactive-color`
+
+> The color to use when a key hasn't been pressed recently.
+>
+> Defaults to `(cRGB) { 0, 0, 0 }`
+
 ## Plugin helpers
 
 ### `STALKER(effect, params)`

src/kaleidoscope/plugin/LED-Stalker.cpp

@@ -24,6 +24,9 @@ uint8_t StalkerEffect::map_[ROWS][COLS];
 StalkerEffect::ColorComputer *StalkerEffect::variant;
 uint16_t StalkerEffect::step_length = 50;
 uint16_t StalkerEffect::step_start_time_;
+cRGB StalkerEffect::inactive_color = (cRGB) {
+  0, 0, 0
+};
 
 void StalkerEffect::onActivate(void) {
   memset(map_, 0, sizeof(map_));
@@ -59,9 +62,7 @@ void StalkerEffect::update(void) {
       }
 
       if (!map_[r][c])
-        ::LEDControl.setCrgbAt(r, c, (cRGB) {
-        0, 0, 0
-      });
+        ::LEDControl.setCrgbAt(r, c, inactive_color);
     }
   }
 

src/kaleidoscope/plugin/LED-Stalker.h

@@ -35,6 +35,7 @@ class StalkerEffect : public LEDMode {
 
   static ColorComputer *variant;
   static uint16_t step_length;
+  static cRGB inactive_color;
 
   EventHandlerResult onKeyswitchEvent(Key &mapped_key, byte row, byte col, uint8_t keyState);