A new config option "GLPlatformInterface" is added to the Compositing
settings group. Valid values are "glx" and "egl". This config option is
honored by the Scene to decide which backend to create.
The setting gets sanitized by the operation mode (egl for Wayland),
the environment variable KWIN_OPENGL_INTERFACE and the compile time
support. These switches are removed from the Scene to not have them
duplicated.
For the time being the current design of Options is more or less kept to
not have to adjust KWin code all over the place. Also for some parts the
generated class from KConfigXT cannot be used due to inter-settings
dependencies defined in the setters.
Options now holds a pointer to a Settings object which is generated from
KConfigXT and uses it to read the default values and the individual
settings. This means the static default value methods are dropped and the
variables are initialized with a normal default value (all int 0, all
boolean false and so on) in the initializer list. Afterwards the values
are set to the correct default value through KConfigXT.
So far for the first step only Windows category is using KConfigXT.
REVIEW: 108572
Apparently it's not allowed to have two groups with the same entry names.
Parameterized groups are still a "TODO" and a group must have a name.
Looks like we won't be able to use KConfigXT for TabBox.
types for a lot of entries and it proly misses a few hidden entries, if you know
those please add those (you can use kcfgcreator if you want to do it quickly)
svn path=/trunk/kdebase/kwin/; revision=311445
