This is a workaround for atspi-atk behaviour.
atspi-atk uses signal emission hooks. So it to already catches
signal emissions on creation of objects, before anyone could even
think of g_signal_connect()ing.
https://bugzilla.gnome.org/show_bug.cgi?id=746706
Put the equality check in front. This allows better detection of when an
insert or delete needs to be emitted.
Also, only emit text-changed:delete if the deleted text is not the empty
string. Only emit text-changed:insert if the inserted text is not the
empty string.
https://bugzilla.gnome.org/show_bug.cgi?id=746706
Compute the new text and its length in advance. This way those
computations will not confuse us when they happen in the middle of the
actual action.
https://bugzilla.gnome.org/show_bug.cgi?id=746706
This commit exposes the get_type() functions and standard
headers for accessible implementations. This makes it possible
to derive from the GTK accessible implementations without
GType magic tricks. This is necessary, because we require the
a11y type hierarchy to be parallel to the widget type hierarchy.
So, if you derive a widget and need to adjust its a11y implementation,
you have to be able to derive its accessible implementation.
This commit probably exposes more than is absolutely necessary,
it also exposes accessibles of widgets that are unlikely candidates
for deriving from.
Move instance fields to a private struct, in preparation
for installing a11y headers.
This also required removing access to GtkRendererCellAccessible innards
from various cell accessible implementations.
1) always emit signals
Previously, newly constructed cells would be told to not emit events.
However, we can ensure that nothing is connected to the signals, so
they will not actually emit anything.
2) don't return anything
The return value is unused anyway.
Various tiny semantic changes in here.
The big fix is that we consider every cell as visible and as showing if
the treeview is mapped.
This was also fixed in the tree dump test.
