Related to Issue #813: fix behaviour of UIImageSwitch in case of touc…

…h automation: the value will return to original AFTER the mouse is released.

The general rule seems to be that endParamEdit should be called in onStopDrag.

flatwidgets/dplug/flatwidgets/flatswitch.d

@@ -101,15 +101,13 @@ nothrow:
  {
  _param.beginParamEdit();
  _param.setFromGUI(_param.defaultValue());
- _param.endParamEdit();
  }
  else
  {
  // Any click => invert
  // Note: double-click doesn't reset to default, would be annoying
  _param.beginParamEdit();
  _param.setFromGUI(!_param.value());
- _param.endParamEdit();
  }
  return Click.startDrag; 
  }
@@ -136,6 +134,10 @@ nothrow:
 
  override void onStopDrag()
  {
+ // End parameter edit at end of dragging, even if no parameter change happen,
+ // so that touch automation restore previous parameter value at the end of the mouse 
+ // gesture.
+ _param.endParamEdit();
  }
 
  override void onMouseDrag(int x, int y, int dx, int dy, MouseState mstate)