Scene Tree Dock: added ability to deselect items when clicking on empty space

editor/scene_tree_editor.cpp

@@ -481,6 +481,12 @@ void SceneTreeEditor::_selected_changed() {
 	blocked--;
 }
 
+void SceneTreeEditor::_deselect_items() {
+
+	// Clear currently elected items in scene tree dock.
+	editor_selection->clear();
+}
+
 void SceneTreeEditor::_cell_multi_selected(Object *p_object, int p_cell, bool p_selected) {
 
 	TreeItem *item = Object::cast_to<TreeItem>(p_object);
@@ -929,6 +935,7 @@ void SceneTreeEditor::_bind_methods() {
 	ClassDB::bind_method("_update_tree", &SceneTreeEditor::_update_tree);
 	ClassDB::bind_method("_node_removed", &SceneTreeEditor::_node_removed);
 	ClassDB::bind_method("_selected_changed", &SceneTreeEditor::_selected_changed);
+	ClassDB::bind_method("_deselect_items", &SceneTreeEditor::_deselect_items);
 	ClassDB::bind_method("_renamed", &SceneTreeEditor::_renamed);
 	ClassDB::bind_method("_rename_node", &SceneTreeEditor::_rename_node);
 	ClassDB::bind_method("_test_update_tree", &SceneTreeEditor::_test_update_tree);
@@ -1005,6 +1012,7 @@ SceneTreeEditor::SceneTreeEditor(bool p_label, bool p_can_rename, bool p_can_ope
 	tree->connect("item_edited", this, "_renamed", varray(), CONNECT_DEFERRED);
 	tree->connect("multi_selected", this, "_cell_multi_selected");
 	tree->connect("button_pressed", this, "_cell_button_pressed");
+	tree->connect("nothing_selected", this, "_deselect_items");
 	//tree->connect("item_edited", this,"_renamed",Vector<Variant>(),true);
 
 	error = memnew(AcceptDialog);

editor/scene_tree_editor.h

@@ -78,6 +78,7 @@ class SceneTreeEditor : public Control {
 	TreeItem *_find(TreeItem *p_node, const NodePath &p_path);
 	void _notification(int p_what);
 	void _selected_changed();
+	void _deselect_items();
 	void _rename_node(ObjectID p_node, const String &p_name);
 
 	void _cell_collapsed(Object *p_obj);

scene/gui/tree.cpp

@@ -1923,6 +1923,9 @@ int Tree::propagate_mouse_event(const Point2i &p_pos, int x_ofs, int y_ofs, bool
 				c = c->next;
 				item_h += child_h;
 			}
+
+			if (!c && !p_mod->get_shift() && !p_mod->get_control() && !p_mod->get_command() && !click_handled && p_button != BUTTON_RIGHT)
+				emit_signal("nothing_selected");
 		}
 	}
 
@@ -3750,6 +3753,7 @@ void Tree::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("custom_popup_edited", PropertyInfo(Variant::BOOL, "arrow_clicked")));
 	ADD_SIGNAL(MethodInfo("item_activated"));
 	ADD_SIGNAL(MethodInfo("column_title_pressed", PropertyInfo(Variant::INT, "column")));
+	ADD_SIGNAL(MethodInfo("nothing_selected"));
 
 	BIND_ENUM_CONSTANT(SELECT_SINGLE);
 	BIND_ENUM_CONSTANT(SELECT_ROW);