Merge pull request #111014 from bruvzg/lbl_sp_x

[TextServer] Enforce zero width spaces and joiners to actually be zero width and not fallback to regular space.

modules/text_server_adv/text_server_adv.cpp

@@ -6861,6 +6861,11 @@ 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;
+			if (zero_w) {
+				gl.index = 0;
+				gl.advance = 0.0;
+			}
 			if ((p_sd->text[glyph_info[i].cluster] == 0x0009) || u_isblank(p_sd->text[glyph_info[i].cluster]) || is_linebreak(p_sd->text[glyph_info[i].cluster])) {
 				adv_rem = 0.0; // Reset on blank.
 			}
@@ -6912,9 +6917,9 @@ void TextServerAdvanced::_shape_run(ShapedTextDataAdvanced *p_sd, int64_t p_star
 			}
 
 			if (p_sd->preserve_control) {
-				last_cluster_valid = last_cluster_valid && ((glyph_info[i].codepoint != 0) || (p_sd->text[glyph_info[i].cluster] == 0x0009) || (u_isblank(p_sd->text[glyph_info[i].cluster]) && (gl.advance != 0)) || (!u_isblank(p_sd->text[glyph_info[i].cluster]) && is_linebreak(p_sd->text[glyph_info[i].cluster])));
+				last_cluster_valid = last_cluster_valid && ((glyph_info[i].codepoint != 0) || zero_w || (p_sd->text[glyph_info[i].cluster] == 0x0009) || (u_isblank(p_sd->text[glyph_info[i].cluster]) && (gl.advance != 0)) || (!u_isblank(p_sd->text[glyph_info[i].cluster]) && is_linebreak(p_sd->text[glyph_info[i].cluster])));
 			} else {
-				last_cluster_valid = last_cluster_valid && ((glyph_info[i].codepoint != 0) || (p_sd->text[glyph_info[i].cluster] == 0x0009) || (u_isblank(p_sd->text[glyph_info[i].cluster]) && (gl.advance != 0)) || (!u_isblank(p_sd->text[glyph_info[i].cluster]) && !u_isgraph(p_sd->text[glyph_info[i].cluster])));
+				last_cluster_valid = last_cluster_valid && ((glyph_info[i].codepoint != 0) || zero_w || (p_sd->text[glyph_info[i].cluster] == 0x0009) || (u_isblank(p_sd->text[glyph_info[i].cluster]) && (gl.advance != 0)) || (!u_isblank(p_sd->text[glyph_info[i].cluster]) && !u_isgraph(p_sd->text[glyph_info[i].cluster])));
 			}
 		}
 		if (p_direction == HB_DIRECTION_LTR || p_direction == HB_DIRECTION_TTB) {