Make sure `Window`'s title is respected before we compute the size

Also removes some suspicious and outdated code that forced this particular
dialog to change size when the warning message changed.

editor/project_manager.cpp

@@ -101,12 +101,6 @@ void ProjectDialog::_set_message(const String &p_msg, MessageType p_type, InputT
 	} else if (current_install_icon != new_icon && input_type == INSTALL_PATH) {
 		install_status_rect->set_texture(new_icon);
 	}
-
-	Size2i window_size = get_size();
-	Size2 contents_min_size = get_contents_minimum_size();
-	if (window_size.x < contents_min_size.x || window_size.y < contents_min_size.y) {
-		set_size(window_size.max(contents_min_size));
-	}
 }
 
 String ProjectDialog::_test_path() {
@@ -868,6 +862,7 @@ ProjectDialog::ProjectDialog() {
 
 	msg = memnew(Label);
 	msg->set_horizontal_alignment(HORIZONTAL_ALIGNMENT_CENTER);
+	msg->set_custom_minimum_size(Size2(200, 0) * EDSCALE);
 	vb->add_child(msg);
 
 	// Renderer selection.

scene/main/window.cpp

@@ -955,6 +955,10 @@ Size2i Window::_clamp_window_size(const Size2i &p_size) {
 
 void Window::_update_window_size() {
 	Size2i size_limit = get_clamped_minimum_size();
+	if (!embedder && window_id != DisplayServer::INVALID_WINDOW_ID && keep_title_visible) {
+		Size2i title_size = DisplayServer::get_singleton()->window_get_title_size(tr_title, window_id);
+		size_limit = size_limit.max(title_size);
+	}
 
 	size = size.max(size_limit);
 
@@ -986,12 +990,6 @@ void Window::_update_window_size() {
 		}
 
 		DisplayServer::get_singleton()->window_set_max_size(max_size_used, window_id);
-
-		if (keep_title_visible) {
-			Size2i title_size = DisplayServer::get_singleton()->window_get_title_size(tr_title, window_id);
-			size_limit = size_limit.max(title_size);
-		}
-
 		DisplayServer::get_singleton()->window_set_min_size(size_limit, window_id);
 		DisplayServer::get_singleton()->window_set_size(size, window_id);
 	}