Implement the non-questionable parts of the Component interface
for accessibles which are widgets.
This does not include:
- global coordinates
- setters
- scrolling
- alpha, layers, zorder, and the like
Make right-aligned content work in resized columns.
There is currently no way to make a title right-aligned,
but we can still make it work correctly. This is a follow
up to 7eb0ae39c5.
Fixes: #3276
When resizing columns, we clip a shrunk column
on the right, so the separator disappears in that
case unless we put it on the left side of the other
column.
Ensure that the column resize cursor stays in place
for the duration of the resize drag. This is a bit
annoying, since the implicit grab can end up on the
header of a different column from the one we are
resizing, so just set the cursor on all column headers.
Make it so that for overlapping resize rectangles (with
very narrow columns), we prefer the narrow column, so you
can regrow a column after shrinking it all the way.
Related: #3274
Ensure that we place the resize rectangle at the visible
right edge of the column, not where the allocation ends
(we clip the header drawing, after all).
Related: #3274
We only want to show relevant, local actions for
widgets, but _gtk_widget_get_action_muxer() will
return the muxer of a parent widget (all the way
up to the toplevel), if the widget does not have
any actions of its own. To detect this situation,
compare what _gtk_widget_get_action_muxer() returns
for the parent widget, and act accordingly.
The buttons here are not really buttons (the action
is not tied to the "clicked" signal), so triggering
the buttons via a11y does not have the expected effect.
And we expose the Value interface that ATs can use
to set the value.
The Selection interface is defined in terms of child
positions, so we need to always translate from that
to model positions if we want to use the selection
model apis.
Add a paragraph to the migration guide that explains
how to properly render symbolic GtkIconPaintables.
Also mention this in the GtkIconPaintable docs.
There's a reason you can't spell 'paintable' without
'pain'...
This implementation works for both GtkListView and
GtkGridView, and by extension, also for GtkColumnView
and GtkDropDown, since those just use a list view
internally.
Use the TREE_GRID, ROW, COLUMN_HEADER and GRID_CELL roles
for the various widgets involved in a GtkColumnView. To
enable this, we subclass GtkListView for the internal
list in the column view.
