docs: Point people at the right place for bugs

Closes #1559

See merge request !498

Unfortunately VLA's are unlikely to be supported on any Visual Studio
versions, although it is C99, so replace it with g_newa() calls.

Do the same style of tests we do for all the
other list models. These tests found the issue
fixed in the previous commit.

We were not skipping an unchanged initial segment
of the slice in some cases. Fix that.

This got broken in commit a33ff4c6.

Testcase included.

The format of the printout will be suitable for addition as a new test to
  testsuite/gtk/rbtree-crash.c
by just grepping the printouts from the relevant rbtree.

Specify the C include for Unix printing API

See merge request !516

We need to tell the portal what filter is supposed to be selected by
default, or it will just pick the first one, which could be wrong and
annoying.

This will require updated xdg-desktop-portal and xdg-desktop-portal-gtk
to work properly.

Fixes #1492

We are casting from GtkFileChooserNative to... GtkFileChooserNative.
Boo.

gtk_file_chooser_set_filter() doesn't work for GtkFileChooserNative. The
code forwards added and removed filters to the delegate dialog, but
doesn't do anything to set the selected one, so the wrong one gets
chosen. So fix that.

This only fixes the fallback dialog. The portal will be fixed in a
subsequent commit.

Partial fix for #1492

Instead of using the INCLUDE directive inside the sections file, we can
specify the default C include in the gtkdoc-mkdb arguments, and override
it inside the C sources that need it.

A11y: export gtk_cell_accessible_parent_get_(row|column)_header_cells

See merge request !505

Add fallback glyphs for GtkSwitch states

See merge request !509

This should behave the same as all the other links
in this dialog.

Closes: #1561

We usually want to do that, but it's wrong for e.g. crossfade nodes.

Since we're not modifying anything...

This gives us a better way of choosing the color of the placeholder text
(and enabled general css styling on it of course).

Closes #378 (If you want to keep the placeholder on focused and empty
entries, just don't set the placeholder opacity to 0 in
entry:focus>placeholder. This is the default behavior but this commit
includes a rule in Adwaita to hide it.

Since we now have a widget whenever we query tooltips, we can as well
get the events target_widget if we have an event (which is what we do
when coming from gtkmain.c). This keeps us from searching the entire
widget hierarchy for the target event even though we've already done
that for pointing events in gtkmain.c

This reduced the work done in gtk_tooltip_handle_event in normal motion
events to basically nothing since we already did all the heavy lifting
when handling the pointing event in gtkmain.c

As stated by the documentation, this should be called when a widget gets
updated, but in that case, one can equally use
gtk_widget_trigger_tooltip_query.

Keyboard mode was only used in gtk_widget_real_show_help before, but now
that's gone and so is any usage of keyboard mode tooltips.

This boolean return was from the old gadget code and we weren't using it
in the new gizmo code.

This is unrelated to any windowing resources these days, so no need for
an unrealize handler.

This was lost it seems

Setting it as qdata on the object doesn't save any memory since we use
the user_data as the event target, which every event has set these days.
This way is also faster since just reffing the object doesn't do any
locking.

We were only drawing the scrolled away first few items

If the text style changes, or the display settings do, we need to update
the state labels to ensure that the glyphs are available in the font
we're using.

We don't use Bugzilla for GTK any more, so our documentation should
reflect that change.

Closes #1559

g-i: Add transfer none annotations for frame clock timings getters

See merge request !511

The entire color scale hack is still done in GtkRange, which draws the
color scale in the range gizmo. So, to correctly redraw the color scale
when setting a new color, we need to redraw the proper widget and that's
the trough widget.

Fixes #1453