Fix warping while dragging the mouse

Before this change, we couldn't use the full functionality of the plugin's
warp feature to drag an item (by holding down a mouse button key). The
plugin would reset the warp state during each scan cycle, so we could
only warp the pointer to a cell in the top-level grid. This fix enables
warping repeatedly into sub-cells while holding a mouse button.

src/Kaleidoscope-MouseKeys.cpp

@@ -83,6 +83,12 @@ Key MouseKeys_::eventHandlerHook(Key mappedKey, byte row, byte col, uint8_t keyS
     uint8_t button = mappedKey.keyCode & ~KEY_MOUSE_BUTTON;
 
     if (keyIsPressed(keyState)) {
+      // Reset warp state on initial mouse button key-down only so we can use
+      // warp keys to drag-and-drop:
+      if (keyToggledOn(keyState)) {
+        MouseWrapper.reset_warping();
+      }
+
       MouseWrapper.pressButton(button);
     } else if (keyToggledOff(keyState)) {
       MouseWrapper.release_button(button);

src/MouseWrapper.cpp

@@ -24,11 +24,11 @@ void MouseWrapper_::begin(void) {
 
 void MouseWrapper_::pressButton(uint8_t button) {
   kaleidoscope::hid::pressMouseButtons(button);
-  end_warping();
 }
 
 void MouseWrapper_::release_button(uint8_t button) {
   kaleidoscope::hid::releaseMouseButtons(button);
+  end_warping();
 }
 
 void MouseWrapper_::warp_jump(uint16_t left, uint16_t top, uint16_t height, uint16_t width) {
@@ -49,6 +49,12 @@ void MouseWrapper_::end_warping() {
   is_warping = false;
 }
 
+void MouseWrapper_::reset_warping() {
+  if (is_warping == true) {
+    begin_warping();
+  }
+}
+
 void MouseWrapper_::warp(uint8_t warp_cmd) {
   if (is_warping == false) {
     begin_warping();

src/MouseWrapper.h

@@ -28,6 +28,7 @@ class MouseWrapper_ {
   static void begin(void);
   static void move(int8_t x, int8_t y);
   static void warp(uint8_t warp_cmd);
+  static void reset_warping();
   static void pressButton(uint8_t button);
   static void release_button(uint8_t button);
   static uint8_t accelStep;