I found a problem in DefaultDesktopPane. Dragging in fast mode does not work correctly (at least not on all platforms) if the pane is obscured by another heavyweight. Graphics.copyArea() isn't guaranteed to work correctly in this case. I think we need to do like in JViewport and check if the heavyweight is guaranteed to be not obscured and only do the fast dragging if this is the case. I pulled the checking code from JViewport to SwingUtilities so they can share this thing.
I know this is a corner case, because in most cases, when dragging an internal frame, the user clicks on the frame and brings the window to the top anyway, so it should not be obscured, but there could be always-on-top dialogs or similar, which stay on top of the app, even when the user drags something. The webrev is here: http://kennke.org/~roman/desktoppane/webrev/ What do you think? Should this be included in OpenJDK? /Roman -- Dipl.-Inform. (FH) Roman Kennke, Software Engineer, http://kennke.org aicas Allerton Interworks Computer Automated Systems GmbH Haid-und-Neu-Straße 18 * D-76131 Karlsruhe * Germany http://www.aicas.com * Tel: +49-721-663 968-48 USt-Id: DE216375633, Handelsregister HRB 109481, AG Karlsruhe Geschäftsführer: Dr. James J. Hunt
