[TextMesh] Fix incorrectly applied FILL alignment.

scene/resources/primitive_meshes.cpp

@@ -2385,6 +2385,9 @@ void TextMesh::_create_mesh_array(Array &p_arr) const {
 
 		dirty_text = false;
 		dirty_font = false;
+		if (horizontal_alignment == HORIZONTAL_ALIGNMENT_FILL) {
+			TS->shaped_text_fit_to_width(text_rid, width, TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_KASHIDA);
+		}
 	} else if (dirty_font) {
 		int spans = TS->shaped_get_span_count(text_rid);
 		for (int i = 0; i < spans; i++) {
@@ -2392,11 +2395,9 @@ void TextMesh::_create_mesh_array(Array &p_arr) const {
 		}
 
 		dirty_font = false;
-	}
-	if (horizontal_alignment == HORIZONTAL_ALIGNMENT_FILL) {
-		TS->shaped_text_fit_to_width(text_rid, width, TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_KASHIDA);
-	} else {
-		TS->shaped_text_fit_to_width(text_rid, -1, TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_KASHIDA);
+		if (horizontal_alignment == HORIZONTAL_ALIGNMENT_FILL) {
+			TS->shaped_text_fit_to_width(text_rid, width, TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_KASHIDA);
+		}
 	}
 
 	Vector2 offset;
@@ -2793,6 +2794,9 @@ TextMesh::~TextMesh() {
 void TextMesh::set_horizontal_alignment(HorizontalAlignment p_alignment) {
 	ERR_FAIL_INDEX((int)p_alignment, 4);
 	if (horizontal_alignment != p_alignment) {
+		if (horizontal_alignment == HORIZONTAL_ALIGNMENT_FILL || p_alignment == HORIZONTAL_ALIGNMENT_FILL) {
+			dirty_text = true;
+		}
 		horizontal_alignment = p_alignment;
 		_request_update();
 	}
@@ -2900,6 +2904,9 @@ real_t TextMesh::get_depth() const {
 void TextMesh::set_width(real_t p_width) {
 	if (width != p_width) {
 		width = p_width;
+		if (horizontal_alignment == HORIZONTAL_ALIGNMENT_FILL) {
+			dirty_text = true;
+		}
 		_request_update();
 	}
 }