Trivial formatting fix
Don't return from a void function

And don't return the value of void functions, either.
treeview tests: Add bug references
treeview tests: Clean up after each test

It is not good form to leak in testcases.
Add a testcase for counting selection in treeviews

https://bugzilla.gnome.org/show_bug.cgi?id=702957
GtkTreeModelFilter: Documentation improvement

Clarify in the docs that some functions can only be called
once for a given filter model.

https://bugzilla.gnome.org/show_bug.cgi?id=346886
GtkTreeView: Don't hardcode black for tree lines

Use the left border color for tree lines. This is similar to
our use of top border color for grid lines. As a side-effect,
tree lines now get recolored when they are in a selected row.

https://bugzilla.gnome.org/show_bug.cgi?id=415415
Adwaita: special case checks/radios on selected bg

Add yet another set of checks and radios assets used in selected
treeview cells and selected list-rows, the standard dark variant assets
work well in those cases so no need for special casing there.
Updated Greek translation
cssshadowvalue: Fix whitespace
gtkcairoblur: Relicense under LGPL

Both Owen Taylor and I, the originators of this code, allow the code
herein be relicensed to the LGPL, which is what GTK+ ships with. This
prevents GTK+ from being GPL-only.
GTK MSVC Projects: Fix Include Directories

Somehow the project files looked for includes in gdk/ before gtk/, which
is wrong.  Fix that.
Adwaita: set padding to 0 for tab buttons
l10n: Update Japanese translation
Adwaita: move the header-bar fill in a mixin.
inspector: Prevent looping when picking widgets

What was happening that the button press event that we use
to select a widget caused another clicked signal emission of
the inspect button, starting another pick action.
Adwaita: GtkFlowBox selected child styling
Adwaita: make links on selected bg visible...
gdk: Add GDK_DRAG_PROTO_WAYLAND

To be used on the wayland windowing backend as the DnD protocol.

https://bugzilla.gnome.org/show_bug.cgi?id=697855
gdk: Remove check for source window

This is backend dependent, on wayland there is no such source window,
not even on local DnD situations.

https://bugzilla.gnome.org/show_bug.cgi?id=697855