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@gneeot:
The problem is that obvious things often get very complicated inside the code ;) and we have
to be very careful to not introduce regressions...
A ton of other functions calls PrivateWindow::addWindowSizeChanges (...) where this bug
happens - th real responsibility for this behaviour is to be found in src/screen.cpp, where
this code can be found:
/* Returns default viewport for some window geometry. If the window spans
 * more than one viewport the most appropriate viewport is returned. How the
 * most appropriate viewport is computed can be made optional if necessary. It
 * is currently computed as the viewport where the center of the window is
 * located.
 *
 * XXX: It is possible for this function to return a negative viewport, which
 * definitely feels wrong, however it seems that some plugins depend on this behaviour
 * so they need to be fixed first
 */
void
compiz::private_screen::viewports::viewportForGeometry (const CompWindow::Geometry &gm,
							CompPoint                  &viewport,
							ViewportRetrievalInterface *viewports,
							const CompSize &           screenSize)

^^ this function is then responsible for returning the wrong workspace, wrong in the sense that
it can be offscreen also...

I see multiple possible solutions, but maybe someone else has some input
as well, ideas are welcome...

One thing is clear: This needs to finally get fixed ;)

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https://bugs.launchpad.net/bugs/776435

Title:
  Window maximizes and semi-maximizes on the wrong workspace

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