Allow underline position variables be buffer-local

* src/nsterm.m (ns_draw_text_decoration):
* src/w32term.c (x_draw_glyph_string):
* src/xterm.c (x_draw_glyph_string): Allow underline-minimum-offset,
underline-at-descent-line, and x-use-underline-position-properties
be buffer local variables.  (Bug#30553)
* src/xdisp.c (syms_of_xdisp) <underline-minimum-offset>: Add DEFSYM.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index c2b3f5d954c..44eb1ebf059 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -33040,6 +33040,7 @@ particularly when using variable `x-use-underline-position-properties'
 with fonts that specify an UNDERLINE_POSITION relatively close to the
 baseline.  The default value is 1.  */);
   underline_minimum_offset = 1;
+  DEFSYM (Qunderline_minimum_offset, "underline-minimum-offset");
 
   DEFVAR_BOOL ("display-hourglass", display_hourglass_p,
                doc: /* Non-nil means show an hourglass pointer, when Emacs is busy.