Broken window origins

[dmik]

If Qt is asked to create a native window for each child widget of a top-level window, the window origin gets broken - its contents appears shifted to the bottom left corner by a few pixels. More over, if you resize such a window, it gets even worse — the window contents gets completely corrupted. It also breaks positioning of pull down and popup menus.

The manual/widgetgrab test is a good demonstration of this. Start it and then press the "Force native widgets" button.

Perhaps, it has something to do with the default aligning of child windows performed by PM and also with the way we calculate the native frame margins for top level windows. Needs checking.

Note that the same reason may be behind the slight shift of dockable toolbars when they are dragged out of the toolbar area to become separate windows. Any example with movable toolbars shows this (e.g. textedit).