Mark dirty flags when shaped texts are invalidated

scene/3d/label_3d.cpp

@@ -418,6 +418,18 @@ void Label3D::_generate_glyph_surfaces(const Glyph &p_glyph, Vector2 &r_offset,
 }
 
 void Label3D::_shape() {
+	// When a shaped text is invalidated by an external source, we want to reshape it.
+	if (!TS->shaped_text_is_ready(text_rid)) {
+		dirty_text = true;
+	}
+
+	for (const RID &line_rid : lines_rid) {
+		if (!TS->shaped_text_is_ready(line_rid)) {
+			dirty_lines = true;
+			break;
+		}
+	}
+
 	// Clear mesh.
 	RS::get_singleton()->mesh_clear(mesh);
 	aabb = AABB();

scene/gui/label.cpp

@@ -345,6 +345,18 @@ void Label::_notification(int p_what) {
 				RenderingServer::get_singleton()->canvas_item_set_clip(get_canvas_item(), true);
 			}
 
+			// When a shaped text is invalidated by an external source, we want to reshape it.
+			if (!TS->shaped_text_is_ready(text_rid)) {
+				dirty = true;
+			}
+
+			for (const RID &line_rid : lines_rid) {
+				if (!TS->shaped_text_is_ready(line_rid)) {
+					lines_dirty = true;
+					break;
+				}
+			}
+
 			if (dirty || font_dirty || lines_dirty) {
 				_shape();
 			}

scene/resources/primitive_meshes.cpp

@@ -2890,6 +2890,18 @@ void TextMesh::_create_mesh_array(Array &p_arr) const {
 		dirty_cache = false;
 	}
 
+	// When a shaped text is invalidated by an external source, we want to reshape it.
+	if (!TS->shaped_text_is_ready(text_rid)) {
+		dirty_text = true;
+	}
+
+	for (const RID &line_rid : lines_rid) {
+		if (!TS->shaped_text_is_ready(line_rid)) {
+			dirty_lines = true;
+			break;
+		}
+	}
+
 	// Update text buffer.
 	if (dirty_text) {
 		TS->shaped_text_clear(text_rid);

scene/resources/text_line.cpp

@@ -101,6 +101,11 @@ void TextLine::_bind_methods() {
 }
 
 void TextLine::_shape() {
+	// When a shaped text is invalidated by an external source, we want to reshape it.
+	if (!TS->shaped_text_is_ready(rid)) {
+		dirty = true;
+	}
+
 	if (dirty) {
 		if (!tab_stops.is_empty()) {
 			TS->shaped_text_tab_align(rid, tab_stops);

scene/resources/text_paragraph.cpp

@@ -134,6 +134,18 @@ void TextParagraph::_bind_methods() {
 }
 
 void TextParagraph::_shape_lines() {
+	// When a shaped text is invalidated by an external source, we want to reshape it.
+	if (!TS->shaped_text_is_ready(rid) || !TS->shaped_text_is_ready(dropcap_rid)) {
+		lines_dirty = true;
+	}
+
+	for (const RID &line_rid : lines_rid) {
+		if (!TS->shaped_text_is_ready(line_rid)) {
+			lines_dirty = true;
+			break;
+		}
+	}
+
 	if (lines_dirty) {
 		for (const RID &line_rid : lines_rid) {
 			TS->free_rid(line_rid);