sw lok comments: implement drag of the scrollbar

With this, if a comment has a vertical scrollbar, then not only the
buttons of the scrollbar can be clicked on, but also the slider of the
scrollbar can be dragged.

Change-Id: I2e39e18bf60c42a878bb8bfd808f1d47be27eecb

sw/source/uibase/docvw/SidebarScrollBar.cxx

@@ -60,6 +60,11 @@ void SidebarScrollBar::LogicInvalidate(const Rectangle* pRectangle)
     rWrtShell.libreOfficeKitCallback(LOK_CALLBACK_INVALIDATE_TILES, sRectangle.getStr());
 }
 
+void SidebarScrollBar::MouseMove(const MouseEvent& rMouseEvent)
+{
+    TrackingEvent aEvent(rMouseEvent);
+    Tracking(aEvent);
+}
 
 SidebarScrollBar::~SidebarScrollBar()
 {

sw/source/uibase/docvw/SidebarScrollBar.hxx

@@ -30,6 +30,7 @@ class SidebarScrollBar : public ScrollBar
 protected:
     /// @see OutputDevice::LogicInvalidate().
     void LogicInvalidate(const Rectangle* pRectangle) override;
+    void MouseMove(const MouseEvent& rMouseEvent) override;
 public:
     SidebarScrollBar(SwSidebarWin& rSidebarWin, WinBits nStyle, SwView& rView);
     virtual ~SidebarScrollBar();

sw/source/uibase/docvw/SidebarWin.cxx

@@ -463,15 +463,15 @@ void SwSidebarWin::KeyInput(const KeyEvent& rKeyEvent)
 
 void SwSidebarWin::MouseMove(const MouseEvent& rMouseEvent)
 {
-    if (mpSidebarTextControl)
+    if (vcl::Window* pHit = lcl_getHitWindow(*this, rMouseEvent))
     {
-        mpSidebarTextControl->Push(PushFlags::MAPMODE);
+        pHit->Push(PushFlags::MAPMODE);
         MouseEvent aMouseEvent(rMouseEvent);
-        lcl_translateTwips(EditWin(), *mpSidebarTextControl, &aMouseEvent);
+        lcl_translateTwips(EditWin(), *pHit, &aMouseEvent);
 
-        mpSidebarTextControl->MouseMove(aMouseEvent);
+        pHit->MouseMove(aMouseEvent);
 
-        mpSidebarTextControl->Pop();
+        pHit->Pop();
     }
 }