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metacity-theme-3.xml: Add a flexible version mechanism
The current mechanism of metacity-theme-1.xml and metacity-theme-2.xml is not flexible for allowing small-scale additions. With this patch we bump the major version version once more to metacity-theme-3.xml and add a single feature: Any element in the DTD can have an attribute: version="[<|<=|=>|>] MAJOR.MINOR" And it will be ignored unless the predicate is met. (< and > should be to be entity escaped as < and >) This allows having alternate sections of the theme file for older and newer version. * Required GLib version is bumped to 2.14 so we can parse versions with a regular expression. * We switch internal version numbers to be "1000 * major + minor" * We keep a stack of the maximum required version for the current portion the XML tree so that the "cannot use versions you don't require" stricture of the old code can be made local to a subpart of the tree. * A version on the top metacity_theme element causes the entire file to be ignored; this allows having one metacity-theme-3.xml for version 3.2 and newer (say) and a metacity-1.xml for everything old. Actual new features will be added starting with 3.1 - 3.0 is just the version="" feature. http://bugzilla.gnome.org/show_bug.cgi?id=592503 NOTE: Patch is copied from mutter and adapted for metacity. origin commit: https://gitlab.gnome.org/GNOME/metacity/commit/114a2048
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