A few more positioning bugs fixed and TODOs. I guess we can merge this now! (The redraw bugs will have to wait.)

TODO.md

@@ -1,3 +1,7 @@
+- windows: should the initial hwndInsertAfter be HWND_BOTTOM for what we want?
+
+- windows: document the rules for controls and containers
+
 - windows: document the minimum size change propagation system
 
 - provisions for controls that cannot be grown? especiailly for windows

windows/tabpage.cpp

@@ -32,8 +32,8 @@ static void tabPageRelayout(struct tabPage *tp)
 	tabPageMargins(tp, &mx, &my);
 	r.left += mx;
 	r.top += my;
-	r.right -= 2 * mx;
-	r.bottom -= 2 * my;
+	r.right -= mx;
+	r.bottom -= my;
 	child = (HWND) uiControlHandle(tp->child);
 	uiWindowsEnsureMoveWindowDuringResize(child, r.left, r.top, r.right - r.left, r.bottom - r.top);
 }