Modify texture of selected tabs to better blend with the panel

scene/resources/default_theme/default_theme.cpp

@@ -730,8 +730,8 @@ void fill_default_theme(Ref<Theme> &theme, const Ref<Font> &default_font, const
 	tc_sb->set_default_margin(MARGIN_TOP, 8 * scale);
 
 	theme->set_stylebox("tab_fg", "TabContainer", sb_expand(make_stylebox(tab_current_png, 4, 4, 4, 1, 16, 4, 16, 4), 2, 2, 2, 2));
-	theme->set_stylebox("tab_bg", "TabContainer", sb_expand(make_stylebox(tab_behind_png, 5, 5, 5, 1, 16, 6, 16, 4), 3, 0, 3, 3));
-	theme->set_stylebox("tab_disabled", "TabContainer", sb_expand(make_stylebox(tab_disabled_png, 5, 5, 5, 1, 16, 6, 16, 4), 3, 0, 3, 3));
+	theme->set_stylebox("tab_bg", "TabContainer", sb_expand(make_stylebox(tab_behind_png, 5, 5, 5, 1, 16, 6, 16, 4), 3, 0, 3, 0));
+	theme->set_stylebox("tab_disabled", "TabContainer", sb_expand(make_stylebox(tab_disabled_png, 5, 5, 5, 1, 16, 6, 16, 4), 3, 0, 3, 0));
 	theme->set_stylebox("panel", "TabContainer", tc_sb);
 
 	theme->set_icon("increment", "TabContainer", make_icon(scroll_button_right_png));