Fix display of tab-bar buttons

* src/xterm.c (x_draw_image_relief):
* src/w32term.c (w32_draw_image_relief): Fix calculation of relief
thickness for tab-bar buttons.

* lisp/tab-bar.el (tab-bar--load-buttons)
(tab-bar-history-mode): Fix the :margin specification for tab-bar
buttons.  (Bug#50424)

2 files changed, 16 insertions, 10 deletions

diff --git a/src/w32term.c b/src/w32term.c
index ad4d1a32829..ebd672361bf 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -2031,11 +2031,14 @@ w32_draw_image_relief (struct glyph_string *s)
   if (s->hl == DRAW_IMAGE_SUNKEN
       || s->hl == DRAW_IMAGE_RAISED)
     {
-      thick = (tab_bar_button_relief < 0
-               ? DEFAULT_TAB_BAR_BUTTON_RELIEF
-               : (tool_bar_button_relief < 0
-                  ? DEFAULT_TOOL_BAR_BUTTON_RELIEF
-                  : min (tool_bar_button_relief, 1000000)));
+      if (s->face->id == TAB_BAR_FACE_ID)
+        thick = (tab_bar_button_relief < 0
+                 ? DEFAULT_TAB_BAR_BUTTON_RELIEF
+                 : min (tab_bar_button_relief, 1000000));
+      else
+        thick = (tool_bar_button_relief < 0
+                 ? DEFAULT_TOOL_BAR_BUTTON_RELIEF
+                 : min (tool_bar_button_relief, 1000000));
       raised_p = s->hl == DRAW_IMAGE_RAISED;
     }
   else
diff --git a/src/xterm.c b/src/xterm.c
index 1887c3255d4..b478eff2906 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -3209,11 +3209,14 @@ x_draw_image_relief (struct glyph_string *s)
   if (s->hl == DRAW_IMAGE_SUNKEN
       || s->hl == DRAW_IMAGE_RAISED)
     {
-      thick = (tab_bar_button_relief < 0
-               ? DEFAULT_TAB_BAR_BUTTON_RELIEF
-               : (tool_bar_button_relief < 0
-                  ? DEFAULT_TOOL_BAR_BUTTON_RELIEF
-                  : min (tool_bar_button_relief, 1000000)));
+      if (s->face->id == TAB_BAR_FACE_ID)
+        thick = (tab_bar_button_relief < 0
+                 ? DEFAULT_TAB_BAR_BUTTON_RELIEF
+                 : min (tab_bar_button_relief, 1000000));
+      else
+        thick = (tool_bar_button_relief < 0
+                 ? DEFAULT_TOOL_BAR_BUTTON_RELIEF
+                 : min (tool_bar_button_relief, 1000000));
       raised_p = s->hl == DRAW_IMAGE_RAISED;
     }
   else