Some keys may have no XKB key symbol, but still have the ability to emit
text. Examples include the "‹" (U+2039) and "›" (U+203A) characters. Add
the text property to key parts so they can emit text even with no key
symbol.
Also, for keys that were not modified by the Function key because they
had no XKB key symbol name, modify them.
It should be possible to build both Wayland (sans D-Bus) and GNOME
versions simultaneously. Add a Wayland target, and, for consistency,
rename the GNOME target.
D-Bus support is large, and should have an option to be excluded. Move
the struct implementing D-Bus support from the dispatcher to the main
file, so it can be replaced with a stub.
The D-Bus interfaces used by Phosh are org.gnome.SessionManager for
recovering critical services from crashes and sm.puri.OSK0 for manual
on-screen keyboard activation. Add support for them.
While the keyboard is running, it may want to automatically show or hide
itself depending on whether a text input is active. Add functions to
show and hide the surface by destroying and re-creating it.
Phosh's compositor, phoc, does not emit configure events in reaction to
a surface being committed with no buffer attached. The complicated
surface creation/destruction process is for compatibility with phoc.
The Held state is for modifier that should be off when the corresponding
key is released. If the user presses the modifier key and a normal key,
it would be in this state. The modifier would continue to be active when
the user moves to a different key part (a cancel, e.g. from Fn to Alt)
afterwards. To fix this, add the HeldPressed and HeldLockedPressed
states that reset to the Released state when cancelled.
Keeping the keys pressed can confuse some compositors, and the key codes
may change. Release any keys that are pressed while the keymap is
changing, and press them again afterwards.
When the surface attaches to a buffer, all other buffers are available.
Export the function used to release a buffer, track the buffer used by
the surface, and release unused buffers when a new buffer is attached.
