GtkFileChooser: Missing hour on today's files for it&hu locales on Win32

The file chooser does not show the hours for files modified today
when using it & hu locales on Win32.  This is due to the %k format conversion
for strftime() that is in Olson's Timezone Package, which msvcrt.dll doesn't have.
Cygwin has it, though.

So for now, we just use a %H format.  While %k would render
six-in-the-morning as " 6" (6 preceded by a space), %H will render it
as "06".

https://bugzilla.gnome.org/show_bug.cgi?id=560337
treeview: Remove duplicate function
filechooser: Actually return a value
testsuite: Don't use deprecated functions
GtkEntry: ellipsize placeholder text

The placeholder string is truncated when there's no
room for it in entry's width.

So, by ellipsizing it, the user can notice the text
was truncated so that they can workaround that by,
for example, maximizing the window.

https://bugzilla.gnome.org/show_bug.cgi?id=702763
Remove rest of gtk-show-input-method-menu and gtk-show-unicode-menu

They are no longer used.
filechooser: In testfilechooser, be strict about the --action option

It would default to GTK_FILE_CHOOSER_ACTION_OPEN if the user's specified --action could not be
parsed.  I can never remember what the right options are, so make the program bail out
if the user specifies an unrecognized option.

Signed-off-by: Federico Mena Quintero <federico@gnome.org>
a11y: Include testdata in EXTRA_DIST

Otherwise tests don't work from a tarball release.
3.9.6
Bump version
GtkFileChooserEntry: don't inline-complete if the entry doesn't have the focus

When the file chooser changes directories, it tells the GtkFileChooserEntry to
change its base folder (i.e. the folder from which relative pathnames are resolved).
GtkFileChooserEntry then starts loading a GtkFileSystemModel asynchronously.
In the finished_loading_cb(), however, it would always ask the GtkEntryCompletion
to insert the completion prefix, since that finished_loading_cb() is what is also used
while the user is typing *in the entry*.

But when the entry doesn't have the focus (e.g. the user changed directories by double-clicking
on the file list in the file chooser), there's no reason to insert completions at all.

https://bugzilla.gnome.org/show_bug.cgi?id=672271
Signed-off-by: Federico Mena Quintero <federico@gnome.org>
GtkFileChooserButton: Also emit 'file-set' when changing the selection through the combo box

https://bugzilla.gnome.org/show_bug.cgi?id=696498
GMenuModel -> GtkMenu binding: show submenu items

In the non-submenu case we bind the 'visibility' attribute to the
tracker, which takes care of showing the item.  In the submenu case, we
don't bind all of the properties, so we miss this one.

Deal with it by just show()ing the submenu item.

https://bugzilla.gnome.org/show_bug.cgi?id=702332
Optimize gdk_x11_screen_supports_net_wm_hint()

Move the call to gdk_x11_atom_to_xatom_for_display() outside of the
search loop in gdk_x11_screen_supports_net_wm_hint().  In my test case
(running Audacious for about a minute), this reduced the total number of
hash table lookups performed from 370,000 to 230,000.

https://bugzilla.gnome.org/show_bug.cgi?id=702913
tests: Ignore deprecations

... for where there's no replacement.
Fix gtk3-demo MSVC Project

Build the new listbox.c source file, as that file was missed.
Remove ancient changelogs

They can be retrieved from git.
Add missing allow-none annotations
textiter: bug fix in forward_search() and backward_search()

When the search is case sensitive, g_utf8_normalize() is not called, so
the skip_decomp argument of the function forward_chars_with_skipping()
must be FALSE.

To verify that, when searching "éb", the count parameter of
forward_chars_with_skipping() have a different value:
- case sensitive: count = 2
- case insensitive: count = 3 (g_utf8_normalize() has been called)

The commit adds unit tests that didn't pass before, and that now pass
(without known regression, obviously).

https://bugzilla.gnome.org/show_bug.cgi?id=702977