Cache the last size of the nsWindow on WIN32 to determine how much to invalidate when widget is resized. Also added checks to see if width or height actually changed before invalidating b=33799 r=buster@netscape.com

widget/src/windows/nsWindow.cpp

@@ -327,8 +327,9 @@ nsWindow::nsWindow() : nsBaseWidget()
     mWindowType         = eWindowType_child;
     mBorderStyle        = eBorderStyle_default;
     mBorderlessParent   = 0;
-   
     mIsInMouseCapture   = PR_FALSE;
+    mLastSize.width = 0;
+    mLastSize.height = 0;
 
 	  mIMEProperty		= 0;
 	  mIMEIsComposing		= PR_FALSE;
@@ -341,6 +342,7 @@ nsWindow::nsWindow() : nsBaseWidget()
 	  mIMECompClauseStringSize = 0;
 	  mIMECompClauseStringLength = 0;
 
+
    static BOOL gbInitHKL = FALSE;
    if(! gbInitHKL)
    {
@@ -2884,40 +2886,38 @@ PRBool nsWindow::ProcessMessage(UINT msg, WPARAM wParam, LPARAM lParam, LRESULT
               newWidth = PRInt32(r.right - r.left);
               newHeight = PRInt32(r.bottom - r.top);
               nsRect rect(wp->x, wp->y, newWidth, newHeight);
-              //if (newWidth != mBounds.width)
+              if (newWidth != mLastSize.width)
               {
                 RECT drect;
 
                 //getting wider
 
-                drect.left = wp->x + mBounds.width;
-                drect.top = wp->y;
-                drect.right = drect.left + (newWidth - mBounds.width);
+                drect.left = wp->x + mLastSize.width;
+                drect.top = wp->y; 
+                drect.right = drect.left + (newWidth - mLastSize.width);
                 drect.bottom = drect.top + newHeight;
 
-//                ::InvalidateRect(mWnd, NULL, FALSE);
-//                ::InvalidateRect(mWnd, &drect, FALSE);
                 ::RedrawWindow(mWnd, &drect, NULL,
                                RDW_INVALIDATE | RDW_NOERASE | RDW_NOINTERNALPAINT | RDW_ERASENOW | RDW_ALLCHILDREN);
               }
-              //if (newHeight != mBounds.height)
+              if (newHeight != mLastSize.height)
               {
                 RECT drect;
 
                 //getting taller
 
                 drect.left = wp->x;
-                drect.top = wp->y + mBounds.height;
+                drect.top = wp->y + mLastSize.height;
                 drect.right = drect.left + newWidth;
-                drect.bottom = drect.top + (newHeight - mBounds.height);
+                drect.bottom = drect.top + (newHeight - mLastSize.height);
 
-//                ::InvalidateRect(mWnd, NULL, FALSE);
-//                ::InvalidateRect(mWnd, &drect, FALSE);
                 ::RedrawWindow(mWnd, &drect, NULL,
                                RDW_INVALIDATE | RDW_NOERASE | RDW_NOINTERNALPAINT | RDW_ERASENOW | RDW_ALLCHILDREN);
               }
               mBounds.width  = newWidth;
               mBounds.height = newHeight;
+              mLastSize.width = newWidth;
+              mLastSize.height = newHeight;
               ///nsRect rect(wp->x, wp->y, wp->cx, wp->cy);
 
               // recalculate the width and height

widget/src/windows/nsWindow.h

@@ -257,6 +257,7 @@ private:
 #endif
 
 protected:
+    nsSize      mLastSize;
     static      nsWindow* gCurrentWindow;
     PRBool      mIsTopWidgetWindow;
     nsPoint     mLastPoint;