Make it possible to disable the double-tap-sticky feature

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

README.md

@@ -20,7 +20,8 @@ still act as normal when held, that behaviour is not lost.
 Furthermore, if a one-shot key is tapped two times in quick succession, it
 becomes sticky, and remains active until disabled with a third tap. This can be
 useful when one needs to input a number of keys with the modifier or layer
-active, and still does not wish to hold the key down.
+active, and still does not wish to hold the key down. If this feature is
+undesirable, unset the `OneShot.double_tap_sticky` property (see later).
 
 To make multi-modifier, or multi-layer shortcuts possible, one-shot keys remain
 active if another one-shot of the same type is tapped, so `Ctrl, Alt, b` becomes
@@ -48,7 +49,7 @@ void setup() {
 
 ## Keymap markup
 
-There are two macros the plugin provides: 
+There are two macros the plugin provides:
 
 ### `OSM(mod)`
 
@@ -111,6 +112,15 @@ modifiers and one-shot layer keys. It has the following methods and properties:
 >
 > Defaults to 200.
 
+### `.double_tap_sticky`
+
+> Set this boolean property to make the plugin treat a double-tap of a one-shot
+> key as making it sticky until a third tap. Setting it to `false` disables this
+> behaviour, in which case double-tapping a one-shot modifier will just restart
+> the timer.
+>
+> Defaults to `true`.
+
 ## Dependencies
 
 * [Kaleidoscope-Ranges](https://github.com/keyboardio/Kaleidoscope-Ranges)

src/Kaleidoscope/OneShot.cpp

@@ -25,6 +25,7 @@ namespace kaleidoscope {
 uint32_t OneShot::start_time_ = 0;
 uint16_t OneShot::time_out = 2500;
 uint16_t OneShot::hold_time_out = 250;
+bool OneShot::double_tap_sticky = true;
 OneShot::state_t OneShot::state_;
 OneShot::state_t OneShot::sticky_state_;
 OneShot::state_t OneShot::pressed_state_;
@@ -130,7 +131,7 @@ Key OneShot::eventHandlerHook(Key mapped_key, byte row, byte col, uint8_t key_st
 
       if (keyToggledOn(key_state)) {
         setPressed(idx);
-        if (isSameAsPrevious(mapped_key)) {
+        if (isSameAsPrevious(mapped_key) && double_tap_sticky) {
           setSticky(idx);
 
           saveAsPrevious(mapped_key);

src/Kaleidoscope/OneShot.h

@@ -39,6 +39,7 @@ class OneShot : public KaleidoscopePlugin {
   }
   static uint16_t time_out;
   static uint16_t hold_time_out;
+  static bool double_tap_sticky;
 
   static bool isModifierActive(Key key);