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Label the entry in the assistant demo.

The demo is called 'Video', so we should actually
use a GtkVideo widget. Doing things this way has
the advantage that we get GL support, which wasn't
working with GtkPicture.

According to OpenGL spec, a shader object will only be flagged
for deletion unless it has been detached; when a program object
is deleted, those shader objects attached to it will be detached
but not deleted unless they have already been flagged for deletion.

So we shall detach a shader object before it is deleted, and delete
it before the program object is deleted best.

Same issue as the previous commit, int+float is error, and pow() only
works on floats.

1. That's a bad idea UI wise as you can't see the search after you
   scrolled.

2. That's a bad idea code-wise because Listviews need to be put into
   a ScrolledWindow or they won't scroll.

When these are installed (in particular, as flatpaks),
we should not hide them.

Fixes: #2932

This commit changes the behavior of window size computation and the
default size properties to:

 * The default-width and default-height properties are updated to the
   current window size unless the size is fixed by e.g. being maxmized,
   tiled etc.
 * The compute-size semantics are to just pick the default size, or if
   not adequate, use the measured size, and consequently update the
   default size, unless unresizable.
 * gtk_window_get_size() is removed, what's more likely relevant is the
   gtk_window_get_default_size() which will now contain more sensible
   values.

Various places that used gtk_window_get_size() were updated to use
gtk_window_get_default_size() to remember and restore previous sizes.

This also changes the default value of 'default-width' and
'default-height' from -1 to 0. The gtk builder simplify tool is taught
how to omit when the default size is set to both -1 and 0.

This makes it more explicit that managers of popovers make it "present".

The file chooser button is gone.

On the macOS OpenGL implementation, the use of noise2 as a
function within the glsl shader collides with the builtin noise2 of a
different signature.

This changes the name to something similar (noize2) so that we
do not risk colliding names when linking.

With this commit, the shadertoy alienplanet demo works on mac
OpenGL (albeit still with the Cairo renderer).

... as discussed in the meeting.

Easter eggs are great, but search shouldn't be one.

We are about to do a stable release. Time to get used
again to plain old, boring header bars.

So the sidebar can get the proper background and border colors.

Show various ways to influence spacing. This is more or
less modeled on the way Androids constraint layout lets
you set up 'chains'.

The fishbowl widget is purely presentational, and its children should
not be visible in the accessibility tree.

It has no accessible content, even if it displays widgets.

This is just to make it easier for myself to
find the right sources.

Add GtkShortcutController as a keyword to some demos that
show its use.

The Characters demo was leaking its columns.

The search entry changes the content of the list view, so we should
mention that relation to assistive technologies.

Add a possible replacement for GtkEntryCompletion
as a demo.

Move the Dropdowns demo to Lists/Selections, and make
it show both GtkDropDown and the suggestion entry, with
some variations.

Put the SvgPaintable implementation into its
own source files, for ease of copying.

For builds that do not have PangoFT2, the demo fails to link because we weren't
building listview_ucd.c.  Fix the build by building listview_ucd.c with
script-names.c and unicode-names.c for all builds, as we now require a Pango
version that already always depends on HarfBuzz and those sources do not use
anything from PangoFT2.

No need to check requires for things that are shipped
with GTK.

This is an interesting case, since it has many labels,
and we are struggling to provide good scrolling performance.

Make the shortcut triggers demo big enough
to not ellipsize the window title.

Make the paintable svg demo follow the same
pattern we use for other demos.

Make the paintable emblems demo follow the same
pattern we use for other demos.

Set a default size, so we don't ellipsize the window
title when the window is presented.