Improve scrolling by performing styling in methods called before drawing instead of inside drawing

which then caused the drawing to be abandoned, and black blocks to appear on-screen.
Discard responsive scrolling overdraw when that overdrawn content is invalid.
Style just the visible area instead of the whole document when styling changes run beyond
painting area.

1 files changed, 3 insertions, 0 deletions

diff --git a/cocoa/ScintillaCocoa.h b/cocoa/ScintillaCocoa.h
index 9098d2000..415094c35 100644
--- a/cocoa/ScintillaCocoa.h
+++ b/cocoa/ScintillaCocoa.h
@@ -113,8 +113,10 @@ private:
 protected:
   Point GetVisibleOriginInMain();
   PRectangle GetClientRectangle();
+  virtual PRectangle GetClientDrawingRectangle();
   Point ConvertPoint(NSPoint point);
   virtual void RedrawRect(PRectangle rc);
+  virtual void DiscardOverdraw();
   virtual void Redraw();
 
   virtual void Initialise();
@@ -144,6 +146,7 @@ public:
   bool SetIdle(bool on);
   void SetMouseCapture(bool on);
   bool HaveMouseCapture();
+  void WillDraw(NSRect rect);
   void ScrollText(int linesToMove);
   void SetVerticalScrollPos();
   void SetHorizontalScrollPos();