Merge pull request godotengine#110317 from bruvzg/ts_zero_w

[TextServer] Do not add extra spacing to zero-width glyphs.

Author: Repiteo

modules/text_server_adv/text_server_adv.cpp

@@ -6816,6 +6816,22 @@ void TextServerAdvanced::_shape_run(ShapedTextDataAdvanced *p_sd, int64_t p_star
 		unsigned int last_cluster_index = 0;
 		bool last_cluster_valid = true;
 
+		unsigned int last_non_zero_w = glyph_count - 1;
+		if (last_run) {
+			for (unsigned int i = glyph_count - 1; i > 0; i--) {
+				last_non_zero_w = i;
+				if (p_sd->orientation == ORIENTATION_HORIZONTAL) {
+					if (glyph_pos[i].x_advance != 0) {
+						break;
+					}
+				} else {
+					if (glyph_pos[i].y_advance != 0) {
+						break;
+					}
+				}
+			}
+		}
+
 		double adv_rem = 0.0;
 		for (unsigned int i = 0; i < glyph_count; i++) {
 			if ((i > 0) && (last_cluster_id != glyph_info[i].cluster)) {
@@ -6907,8 +6923,8 @@ void TextServerAdvanced::_shape_run(ShapedTextDataAdvanced *p_sd, int64_t p_star
 					gl.x_off += _font_get_baseline_offset(gl.font_rid) * (double)(_font_get_ascent(gl.font_rid, gl.font_size) + _font_get_descent(gl.font_rid, gl.font_size));
 				}
 			}
-			if (!last_run || i < glyph_count - 1) {
-				// Do not add extra spacing to the last glyph of the string.
+			if ((!last_run || i < last_non_zero_w) && !Math::is_zero_approx(gl.advance)) {
+				// Do not add extra spacing to the last glyph of the string and zero width glyphs.
 				if (sp_sp && is_whitespace(p_sd->text[glyph_info[i].cluster])) {
 					gl.advance += sp_sp;
 				} else {

modules/text_server_fb/text_server_fb.cpp

@@ -4810,6 +4810,17 @@ bool TextServerFallback::_shaped_text_shape(const RID &p_shaped) {
 			sd->glyphs.push_back(gl);
 		} else {
 			// Text span.
+			int last_non_zero_w = sd->end - 1;
+			if (i == sd->spans.size() - 1) {
+				for (int j = span.end - 1; j > span.start; j--) {
+					last_non_zero_w = j;
+					uint32_t idx = (int32_t)sd->text[j - sd->start];
+					if (!is_control(idx) && !(idx >= 0x200B && idx <= 0x200D)) {
+						break;
+					}
+				}
+			}
+
 			RID prev_font;
 			for (int j = span.start; j < span.end; j++) {
 				Glyph gl;
@@ -4819,7 +4830,8 @@ bool TextServerFallback::_shaped_text_shape(const RID &p_shaped) {
 				gl.count = 1;
 				gl.font_size = span.font_size;
 				gl.index = (int32_t)sd->text[j - sd->start]; // Use codepoint.
-				if (gl.index == 0x0009 || gl.index == 0x000b) {
+				bool zw = (gl.index >= 0x200b && gl.index <= 0x200d);
+				if (gl.index == 0x0009 || gl.index == 0x000b || zw) {
 					gl.index = 0x0020;
 				}
 				if (!sd->preserve_control && is_control(gl.index)) {
@@ -4865,8 +4877,11 @@ bool TextServerFallback::_shaped_text_shape(const RID &p_shaped) {
 							sd->descent = MAX(sd->descent, Math::round(_font_get_glyph_advance(gl.font_rid, gl.font_size, gl.index).x * 0.5));
 						}
 					}
-					if (j < sd->end - 1) {
-						// Do not add extra spacing to the last glyph of the string.
+					if (zw) {
+						gl.advance = 0.0;
+					}
+					if ((j < last_non_zero_w) && !Math::is_zero_approx(gl.advance)) {
+						// Do not add extra spacing to the last glyph of the string and zero width glyphs.
 						if (is_whitespace(sd->text[j - sd->start])) {
 							gl.advance += sd->extra_spacing[SPACING_SPACE] + _font_get_spacing(gl.font_rid, SPACING_SPACE);
 						} else {