Set main window min. size via Window object instead of DisplayServer to preserve it during window updates.

editor/editor_node.cpp

@@ -6113,7 +6113,10 @@ EditorNode::EditorNode() {
 	}
 
 	// Define a minimum window size to prevent UI elements from overlapping or being cut off.
-	DisplayServer::get_singleton()->window_set_min_size(Size2(1024, 600) * EDSCALE);
+	Window *w = Object::cast_to<Window>(SceneTree::get_singleton()->get_root());
+	if (w) {
+		w->set_min_size(Size2(1024, 600) * EDSCALE);
+	}
 
 	FileDialog::set_default_show_hidden_files(EDITOR_GET("filesystem/file_dialog/show_hidden_files"));
 	EditorFileDialog::set_default_show_hidden_files(EDITOR_GET("filesystem/file_dialog/show_hidden_files"));

editor/project_manager.cpp

@@ -3008,7 +3008,10 @@ ProjectManager::ProjectManager() {
 	SceneTree::get_singleton()->get_root()->connect("files_dropped", callable_mp(this, &ProjectManager::_files_dropped));
 
 	// Define a minimum window size to prevent UI elements from overlapping or being cut off.
-	DisplayServer::get_singleton()->window_set_min_size(Size2(520, 350) * EDSCALE);
+	Window *w = Object::cast_to<Window>(SceneTree::get_singleton()->get_root());
+	if (w) {
+		w->set_min_size(Size2(520, 350) * EDSCALE);
+	}
 
 	// Resize the bootsplash window based on Editor display scale EDSCALE.
 	float scale_factor = MAX(1, EDSCALE);

main/main.cpp

@@ -2902,10 +2902,6 @@ bool Main::start() {
 			DisplayServer::get_singleton()->window_set_title(appname);
 #endif
 
-			// Define a very small minimum window size to prevent bugs such as GH-37242.
-			// It can still be overridden by the user in a script.
-			DisplayServer::get_singleton()->window_set_min_size(Size2i(64, 64));
-
 			bool snap_controls = GLOBAL_GET("gui/common/snap_controls_to_pixels");
 			sml->get_root()->set_snap_controls_to_pixels(snap_controls);
 

scene/main/scene_tree.cpp

@@ -1397,6 +1397,7 @@ SceneTree::SceneTree() {
 	// Create with mainloop.
 
 	root = memnew(Window);
+	root->set_min_size(Size2i(64, 64)); // Define a very small minimum window size to prevent bugs such as GH-37242.
 	root->set_process_mode(Node::PROCESS_MODE_PAUSABLE);
 	root->set_name("root");
 	root->set_title(GLOBAL_GET("application/config/name"));