This patch removes the X11 specific code from MetaBarrier and creates an
abstraction layer MetaBarrierImpl. The existing X11 implementation is
moved to a new GObject MetaBarrierImplX11 implementing the abstract
interface MetaBarrierImpl which is instantiated by MetaBarrier when
supported.
While at it, move it to backends/ and properly name the files.
https://bugzilla.gnome.org/show_bug.cgi?id=706655
EDID parsing has been refactored to a common meta_output_parse_edid()
function, which ensures the extracted information is the same on both KMS
and X11 backend, so it can be used consistently on eg. settings values.
https://bugzilla.gnome.org/show_bug.cgi?id=742882
Commit 7e66d2a484e4b2 killed off META_CORE_GET_FRAME_TYPE, but got
the replacement wrong - MetaWindowType is an enum like MetaFrameType,
but the two are not interchangeable.
https://bugzilla.gnome.org/show_bug.cgi?id=742841
MetaKeyCombo is about the *unresolved* keybinding, which can either be a
"keysym" (<Ctrl>F) or a "keycode" (<Ctrl>0x21). When we resolved the
keysym to a keycode, we stuffed it back in the same MetaKeyCombo, which
confused about what the "keycode" field was for. Thus, we often stomped
on the user's explicit choice if they chose a keycode binding value.
To solve this, create a separate structure, the "devirtualized key combo"
or MetaKeyDevirtCombo, which contains a resolved keycode from the
keysym, and a devirtualized modifier mask. The MetaKeyCombo is now
always a "source" value, and the MetaKeyDevirtCombo is now always what
the user chose.
This also lets us significantly clean up the overlay and ISO key binding
paths.
The reason MetaKeyCombo has a keycode value at all is *not* to store the
devirtualized keycode from the keysym, but instead to allow people that
type in "0x55" into the preference. Everything except the overlay-key
respected this. Make the overlay-key binding respect this.
Break down the beautiful core/ui abstraction barrier by inserting
a pointer to MetaWindow into a MetaUIFrame. I'm a scoundrel, I know.
We'll use this very soon to destroy meta_core_get.
Whenever we added a frame to the GHashTable, we added the frame itself
as the value, and a pointer to its storage of the frame window XID,
as the key.
When we iterated over the hash table, we actually looked up the
MetaUIFrame in the key, which might seem extraordinarily wrong, but
eagle-eyed viewers might notice that the XID is the first field in
MetaUIFrame, so the key and value are actually the same pointer.
Changing the layout of MetaUIFrame at all causes this to go haywire,
so let's not do this and simply put the MetaUIFrame in the value,
as expected.
When the frame type updates, we were doing something funky that
caused us to reset the title used for the text layout here. I can't
really think of any place that it would trigger, and in testing I
haven't hit this either, so let's just remove the fancy logic and
assert this.
