Our minimum GTK3 version is 3.10, the font filter functions appeared
in 3.2.

* gtkutil.c (xg_font_filter) [HAVE_GTK3]: Just check for HAVE_GTK3.
(xg_get_font) [HAVE_GTK3]: Same here.

* src/xftfont.c (xftfont_open): FC_CHARCELL is apparently an alias
for FC_DUAL used in some east Asian fonts (bug#35079).  Modelled
after a patch suggested by Kenichi Handa.

* src/w32font.c (w32_to_fc_weight): Support a few more weight
values, for compatibility with the GTK font selection widget
(see gtkutil.c:XG_WEIGHT_TO_SYMBOL).  (Bug#24226)

* src/xdisp.c (extend_face_to_end_of_line): Fix padding of R2L
screen lines with stretch glyph on the left.  (Bug#38233)

* src/w32term.c (w32_read_socket):
* src/xterm.c (handle_one_xevent): Do not report move frame events
for tooltip frames (Bug#38213).

* src/floatfns.c (double_integer_scale): Simplify, so that the
function works when (FP_ILOGBNAN == INT_MAX && FP_ILOGB0 == INT_MIN),
as on Solaris.

The old code assumed that hexdigit initialization (needed by
non-GCC) could be done in syms_of_character, but that is no longer
true with pdumper.  Instead, simplify hexdigit init so that it can
be done statically on all C99 platforms.  Problem discovered on
Solaris 10 sparc + Oracle Solaris Studio 12.6.
* src/character.c (hexdigit): Add 1 to every value; all uses
changed.  This simplifies the initialization so that it can be
done statically on any C99 compiler.  hexdigit is now always const.
(syms_of_character): Omit no-longer-necessary initialization.
* src/character.h (HEXDIGIT_CONST, HEXDIGIT_IS_CONST):
Remove.  All uses removed.

* doc/lispref/variables.texi (Watching Variables): Clarify the
documentation of 'add-variable-watcher' and fix markup.

* src/data.c (Fadd_variable_watcher): Clarify the doc string.
(Bug#38205)

* src/xdisp.c (tty_handle_tab_bar_click): Revert the last
change which made this work only in the HAVE_NTGUI build.
This function is needed by any build which supports a  mouse
on TTY frames.