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[Backport to 3.38] window-props: Also check for actual values change

Olivier Fourdan requested to merge ofourdan/mutter:backport-3-38-xsizehits-fix into gnome-3-38

Commit e28c1ab4 added a hints_have_changed() function to only recalculate windows features when the WM_NORMAL_HINTS change.

That function hints_have_changed() however was merely checking whether the various XSizeHints flags where flipped, which is not sufficient because the hints may remain the same while the actual values are changed.

Not checking for the actual value differences would prevent some windows from being able to switch fullscreen.

Improve the helper function hints_have_changed() to check not only for flags being flipped, but also for the values being changed for each relevant XSizeHints flags being set currently.

Closes: #1534 (closed) Part-of: !1566 (merged) (cherry picked from commit 06e604cf)

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