Don't emit a useless warning

The warning may have had some value at some point, but if
people uninstall large icons just to make the warning go
away, it does more harm than good. So just remove it.
Fix a typo
Trivial formatting fix
GtkCalendar: deal better with a large allocation

When allocated more than the requested height, GtkCalendar
was 'falling apart'. Not only was the main part rendered
at the far end of the allocation, clicking on days was
broken in this scenario.

Fix this by always placing the main part directly under
the header and day names.

https://bugzilla.gnome.org/show_bug.cgi?id=737670
GtkSidebar: not a listbox anymore

Applications are not expected to call GtkListBox API on a
sidebar, so don't make it one. Instead, make it have a
listbox.
GtkFontButton: Stop using deprecated API
GtkColorEditor: Stop using deprecated API

This call was not needed at all.
GtkColorEditor: Fix missing background in popups
GtkFontChooserWidget: Stop using deprecated API
GtkCellRendererAccel: Stop using deprecated API
Remove redundant checks for NULL

Remove checks for NULL before g_free() and g_clear_object().
Merge check for NULL, freeing of pointer and its setting
to NULL by g_clear_pointer().

https://bugzilla.gnome.org/show_bug.cgi?id=733157
Adwaita: selectors cleanup and some refactoring
Adwaita: needs-attention on sidebar-item

Unfortunatelly it doesn't animate (not my fault) and it just work
on GtkLabel (my fault).
Updated POTFILES.in
GtkSidebar: Scroll when needed
gtk-demo: Make the sidebar demo scroll
GtkExpander: Fix a problem with resize-toplevel

The toplevel resizing was not working properly when the
content had non-trivial height-for-width behavior (such
as a wrapping label).
Make non-ASCII strings in ui files work

Our extractor tool was not calling setlocale(), thus it only
produced output in the C locale, ie ASCII. Oops.
Properly extract strings from gtkprintunixdialog.ui

Since 972136803aa4f83e7, gtkprintunixdialog.ui contains non-ASCII
in translatable strings. These were not properly extracted.
widget-factory: Add a scale button

Instead of two volume buttons, make the second one a scale button
and use microphones.