Always emit dynamic font change in update_oversampling

Fixes #15787.

The issue occurred when two (or more) separate DynamicFont instances
used the same DynamicFontAtSize instance due to having equal
properties. The first instance updated its data_at_size and emitted
"changed" signal, but the second did not because it considered the
data_at_size to be up to date, even though it has just been updated.

scene/gui/label.cpp

@@ -93,7 +93,7 @@ void Label::_notification(int p_what) {
 		bool use_outline = get_constant("shadow_as_outline");
 		Point2 shadow_ofs(get_constant("shadow_offset_x"), get_constant("shadow_offset_y"));
 		int line_spacing = get_constant("line_spacing");
-		Color font_outline_modulator = get_color("font_outline_modulator");
+		Color font_outline_modulate = get_color("font_outline_modulate");
 
 		style->draw(ci, Rect2(Point2(0, 0), get_size()));
 
@@ -151,7 +151,7 @@ void Label::_notification(int p_what) {
 
 		int line = 0;
 		int line_to = lines_skipped + (lines_visible > 0 ? lines_visible : 1);
-		FontDrawer drawer(font, font_outline_modulator);
+		FontDrawer drawer(font, font_outline_modulate);
 		while (wc) {
 			/* handle lines not meant to be drawn quickly */
 			if (line >= line_to)

scene/resources/default_theme/default_theme.cpp

@@ -415,7 +415,7 @@ void fill_default_theme(Ref<Theme> &theme, const Ref<Font> &default_font, const
 
 	theme->set_color("font_color", "Label", Color(1, 1, 1));
 	theme->set_color("font_color_shadow", "Label", Color(0, 0, 0, 0));
-	theme->set_color("font_outline_modulator", "Label", Color(1, 1, 1));
+	theme->set_color("font_outline_modulate", "Label", Color(1, 1, 1));
 
 	theme->set_constant("shadow_offset_x", "Label", 1 * scale);
 	theme->set_constant("shadow_offset_y", "Label", 1 * scale);

scene/resources/dynamic_font.cpp

@@ -444,7 +444,7 @@ DynamicFontAtSize::TexturePosition DynamicFontAtSize::_find_texture_pos_for_glyp
 		ret.x = 0;
 		ret.y = 0;
 
-		int texsize = MAX(id.size * 8, 256);
+		int texsize = MAX(id.size * oversampling * 8, 256);
 		if (mw > texsize)
 			texsize = mw; //special case, adapt to it?
 		if (mh > texsize)
@@ -644,11 +644,9 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 	char_map[p_char] = character;
 }
 
-bool DynamicFontAtSize::update_oversampling() {
-	if (oversampling == font_oversampling)
-		return false;
-	if (!valid)
-		return false;
+void DynamicFontAtSize::update_oversampling() {
+	if (oversampling == font_oversampling || !valid)
+		return;
 
 	FT_Done_FreeType(library);
 	textures.clear();
@@ -656,8 +654,6 @@ bool DynamicFontAtSize::update_oversampling() {
 	oversampling = font_oversampling;
 	valid = false;
 	_load();
-
-	return true;
 }
 
 DynamicFontAtSize::DynamicFontAtSize() {
@@ -1082,7 +1078,8 @@ void DynamicFont::update_oversampling() {
 	SelfList<DynamicFont> *E = dynamic_fonts.first();
 	while (E) {
 
-		if (E->self()->data_at_size.is_valid() && E->self()->data_at_size->update_oversampling()) {
+		if (E->self()->data_at_size.is_valid()) {
+			E->self()->data_at_size->update_oversampling();
 			changed.push_back(Ref<DynamicFont>(E->self()));
 		}
 		E = E->next();

scene/resources/dynamic_font.h

@@ -192,7 +192,7 @@ public:
 	float draw_char(RID p_canvas_item, const Point2 &p_pos, CharType p_char, CharType p_next, const Color &p_modulate, const Vector<Ref<DynamicFontAtSize> > &p_fallbacks, bool p_advance_only = false) const;
 
 	void set_texture_flags(uint32_t p_flags);
-	bool update_oversampling();
+	void update_oversampling();
 
 	DynamicFontAtSize();
 	~DynamicFontAtSize();