Checked Windows RECT usage and fixed wrong ones.

area_windows.go

@@ -77,6 +77,7 @@ func paintArea(s *sysData) {
 
 	hscroll, vscroll := getScrollPos(s.hwnd)
 
+	// both Windows RECT and Go image.Rect are point..point, so the following is correct
 	cliprect := image.Rect(int(xrect.left), int(xrect.top), int(xrect.right), int(xrect.bottom))
 	cliprect = cliprect.Add(image.Pt(int(hscroll), int(vscroll)))			// adjust by scroll position
 	// make sure the cliprect doesn't fall outside the size of the Area

stdwndclass_windows.go

@@ -158,7 +158,7 @@ func stdWndProc(hwnd _HWND, uMsg uint32, wParam _WPARAM, lParam _LPARAM) _LRESUL
 				panic("GetClientRect failed: " + err.Error())
 			}
 			// top-left corner is (0,0) so no need for winheight
-			s.doResize(int(r.left), int(r.top), int(r.right), int(r.bottom), 0)
+			s.doResize(int(r.left), int(r.top), int(r.right - r.left), int(r.bottom - r.top), 0)
 			// TODO use the Defer movement functions here?
 			// TODO redraw window and all children here?
 		}

todo.md

@@ -7,7 +7,6 @@ MAC OS X:
 WINDOWS:
 - windows: windows key handling is just wrong; figure out how to avoid (especially since Windows intercepts that key by default)
 - redrawing controls after a window resize on Windows does not work properly
-- check all uses of RECT.right/.bottom in Windows that don't have an accompanying -RECT.left/.top to make sure they're correct
 - when adding IsDialogMessage() find out if that make sthe area in the area bounds test automatically focused
 
 UNIX: