MouseClick: Split mouse click when <on>begin-and-end</on>

When the `begin-and-end` option is used, the mouse button is down when
the gesture begins and up when the gesture ends.

README.md

@@ -683,6 +683,8 @@ Options:
 | button | `1`/`2`/`3`/`8`/`9` | Left click (1), middle click (2), right click (3), back button (8) or forward button (9) |
 | on | `begin`/`end`/`begin-and-end` | If the mouse click should be executed on the beginning and/or on the end of the gesture. |
 
+When the `begin-and-end` option is used, the mouse button is down when the gesture begins and up when the gesture ends.
+
 Example:
 
 ```xml

src/actions/mouse-click.cpp

@@ -28,15 +28,21 @@ void MouseClick::onGestureBegin(const Gesture& /*gesture*/) {
 
   if (shouldExecuteAction(ExecuteActionOn::BEGIN, this->executeActionOn)) {
     this->windowSystem.sendMouseDown(this->button);
-    this->windowSystem.sendMouseUp(this->button);
+
+    if (this->executeActionOn != ExecuteActionOn::BEGIN_AND_END) {
+      this->windowSystem.sendMouseUp(this->button);
+    }
   }
 }
 
 void MouseClick::onGestureUpdate(const Gesture& /*gesture*/) {}
 
 void MouseClick::onGestureEnd(const Gesture& /*gesture*/) {
   if (shouldExecuteAction(ExecuteActionOn::END, this->executeActionOn)) {
-    this->windowSystem.sendMouseDown(this->button);
+    if (this->executeActionOn != ExecuteActionOn::BEGIN_AND_END) {
+      this->windowSystem.sendMouseDown(this->button);
+    }
+
     this->windowSystem.sendMouseUp(this->button);
   }
 }