Enforce zero width spaces and joiners with missing font. Do not warn about missing non-visual characters.

Author: bruvzg

modules/text_server_adv/text_server_adv.cpp

@@ -6734,6 +6734,11 @@ void TextServerAdvanced::_shape_run(ShapedTextDataAdvanced *p_sd, int64_t p_star
 						p_sd->descent = MAX(p_sd->descent, Math::round(get_hex_code_box_size(fs, gl.index).x * 0.5));
 					}
 				}
+				bool zero_w = (p_sd->preserve_control) ? (p_sd->text[i] == 0x200B || p_sd->text[i] == 0xFEFF) : ((p_sd->text[i] >= 0x200B && p_sd->text[i] <= 0x200D) || p_sd->text[i] == 0x2060 || p_sd->text[i] == 0xFEFF);
+				if (zero_w) {
+					gl.index = 0;
+					gl.advance = 0.0;
+				}
 
 				p_sd->width += gl.advance;
 
@@ -6877,7 +6882,7 @@ void TextServerAdvanced::_shape_run(ShapedTextDataAdvanced *p_sd, int64_t p_star
 #endif
 
 			gl.index = glyph_info[i].codepoint;
-			bool zero_w = (p_sd->preserve_control) ? (p_sd->text[glyph_info[i].cluster] == 0x200B || p_sd->text[glyph_info[i].cluster] == 0xFEF) : (p_sd->text[glyph_info[i].cluster] >= 0x200B && p_sd->text[glyph_info[i].cluster] <= 0x200D) || p_sd->text[glyph_info[i].cluster] == 0x2060 || p_sd->text[glyph_info[i].cluster] == 0xFEFF;
+			bool zero_w = (p_sd->preserve_control) ? (p_sd->text[glyph_info[i].cluster] == 0x200B || p_sd->text[glyph_info[i].cluster] == 0xFEFF) : ((p_sd->text[glyph_info[i].cluster] >= 0x200B && p_sd->text[glyph_info[i].cluster] <= 0x200D) || p_sd->text[glyph_info[i].cluster] == 0x2060 || p_sd->text[glyph_info[i].cluster] == 0xFEFF);
 			if (zero_w) {
 				gl.index = 0;
 				gl.advance = 0.0;

scene/gui/label.cpp

@@ -649,7 +649,7 @@ PackedStringArray Label::get_configuration_warnings() const {
 			const Glyph *glyph = TS->shaped_text_get_glyphs(para.text_rid);
 			int64_t glyph_count = TS->shaped_text_get_glyph_count(para.text_rid);
 			for (int64_t i = 0; i < glyph_count; i++) {
-				if (glyph[i].font_rid == RID()) {
+				if (glyph[i].font_rid == RID() && glyph[i].index != 0) {
 					warnings.push_back(RTR("The current font does not support rendering one or more characters used in this Label's text."));
 					break;
 				}