Better deselection handling in AnimationTree editors

editor/animation/animation_blend_space_1d_editor.cpp

@@ -143,6 +143,11 @@ void AnimationNodeBlendSpace1DEditor::_blend_space_gui_input(const Ref<InputEven
 				return;
 			}
 		}
+
+		// If no point was selected, select host BlendSpace1D node.
+		if (selected_point == -1) {
+			EditorNode::get_singleton()->push_item(blend_space.ptr(), "", true);
+		}
 	}
 
 	if (mb.is_valid() && !mb->is_pressed() && dragging_selected_attempt && mb->get_button_index() == MouseButton::LEFT) {
@@ -529,7 +534,11 @@ void AnimationNodeBlendSpace1DEditor::_erase_selected() {
 		undo_redo->add_undo_method(this, "_update_space");
 		undo_redo->commit_action();
 
+		// Return selection to host BlendSpace1D node.
+		EditorNode::get_singleton()->push_item(blend_space.ptr(), "", true);
+
 		updating = false;
+		_update_tool_erase();
 
 		blend_space_draw->queue_redraw();
 	}

editor/animation/animation_blend_space_2d_editor.cpp

@@ -203,6 +203,11 @@ void AnimationNodeBlendSpace2DEditor::_blend_space_gui_input(const Ref<InputEven
 				}
 			}
 		}
+
+		// If no point or triangle was selected, select host BlendSpace2D node.
+		if (selected_point == -1 && selected_triangle == -1) {
+			EditorNode::get_singleton()->push_item(blend_space.ptr(), "", true);
+		}
 	}
 
 	if (mb.is_valid() && mb->is_pressed() && tool_triangle->is_pressed() && mb->get_button_index() == MouseButton::LEFT) {
@@ -727,7 +732,12 @@ void AnimationNodeBlendSpace2DEditor::_erase_selected() {
 		undo_redo->add_do_method(this, "_update_space");
 		undo_redo->add_undo_method(this, "_update_space");
 		undo_redo->commit_action();
+
+		// Return selection to host BlendSpace2D node.
+		EditorNode::get_singleton()->push_item(blend_space.ptr(), "", true);
+
 		updating = false;
+		_update_tool_erase();
 
 		blend_space_draw->queue_redraw();
 	} else if (selected_triangle != -1) {
@@ -739,7 +749,11 @@ void AnimationNodeBlendSpace2DEditor::_erase_selected() {
 		undo_redo->add_do_method(this, "_update_space");
 		undo_redo->add_undo_method(this, "_update_space");
 		undo_redo->commit_action();
+
+		selected_triangle = -1;
+
 		updating = false;
+		_update_tool_erase();
 
 		blend_space_draw->queue_redraw();
 	}

editor/animation/animation_blend_tree_editor_plugin.cpp

@@ -127,6 +127,15 @@ void AnimationNodeBlendTreeEditor::update_graph() {
 
 	visible_properties.clear();
 
+	// Store selected nodes before clearing the graph.
+	List<StringName> selected_nodes;
+	for (int i = 0; i < graph->get_child_count(); i++) {
+		GraphNode *gn = Object::cast_to<GraphNode>(graph->get_child(i));
+		if (gn && gn->is_selected()) {
+			selected_nodes.push_back(gn->get_name());
+		}
+	}
+
 	graph->set_scroll_offset(blend_tree->get_graph_offset() * EDSCALE);
 
 	graph->clear_connections();
@@ -304,6 +313,17 @@ void AnimationNodeBlendTreeEditor::update_graph() {
 	graph->set_minimap_opacity(graph_minimap_opacity);
 	float graph_lines_curvature = EDITOR_GET("editors/visual_editors/lines_curvature");
 	graph->set_connection_lines_curvature(graph_lines_curvature);
+
+	// Restore selected nodes after graph reconstruction.
+	for (const StringName &name : selected_nodes) {
+		for (int i = 0; i < graph->get_child_count(); i++) {
+			GraphNode *gn = Object::cast_to<GraphNode>(graph->get_child(i));
+			if (gn && gn->get_name() == name) {
+				gn->set_selected(true);
+				break;
+			}
+		}
+	}
 }
 
 void AnimationNodeBlendTreeEditor::_file_opened(const String &p_file) {
@@ -539,6 +559,9 @@ void AnimationNodeBlendTreeEditor::_delete_node_request(const String &p_which) {
 	undo_redo->add_do_method(this, "update_graph");
 	undo_redo->add_undo_method(this, "update_graph");
 	undo_redo->commit_action();
+
+	// Return selection to host BlendTree node.
+	EditorNode::get_singleton()->push_item(blend_tree.ptr(), "", true);
 }
 
 void AnimationNodeBlendTreeEditor::_delete_nodes_request(const TypedArray<StringName> &p_nodes) {
@@ -597,6 +620,22 @@ void AnimationNodeBlendTreeEditor::_node_selected(Object *p_node) {
 	EditorNode::get_singleton()->push_item(anode.ptr(), "", true);
 }
 
+void AnimationNodeBlendTreeEditor::_node_deselected(Object *p_node) {
+	// Check if no nodes are selected, return selection to host BlendTree node.
+	bool any_selected = false;
+	for (int i = 0; i < graph->get_child_count(); i++) {
+		GraphNode *gn = Object::cast_to<GraphNode>(graph->get_child(i));
+		if (gn && gn->is_selected()) {
+			any_selected = true;
+			break;
+		}
+	}
+
+	if (!any_selected) {
+		EditorNode::get_singleton()->push_item(blend_tree.ptr(), "", true);
+	}
+}
+
 void AnimationNodeBlendTreeEditor::_open_in_editor(const String &p_which) {
 	Ref<AnimationNode> an = blend_tree->get_node(p_which);
 	ERR_FAIL_COND(an.is_null());
@@ -1192,6 +1231,7 @@ AnimationNodeBlendTreeEditor::AnimationNodeBlendTreeEditor() {
 	graph->connect("connection_request", callable_mp(this, &AnimationNodeBlendTreeEditor::_connection_request), CONNECT_DEFERRED);
 	graph->connect("disconnection_request", callable_mp(this, &AnimationNodeBlendTreeEditor::_disconnection_request), CONNECT_DEFERRED);
 	graph->connect("node_selected", callable_mp(this, &AnimationNodeBlendTreeEditor::_node_selected));
+	graph->connect("node_deselected", callable_mp(this, &AnimationNodeBlendTreeEditor::_node_deselected));
 	graph->connect("scroll_offset_changed", callable_mp(this, &AnimationNodeBlendTreeEditor::_scroll_changed));
 	graph->connect("delete_nodes_request", callable_mp(this, &AnimationNodeBlendTreeEditor::_delete_nodes_request));
 	graph->connect("popup_request", callable_mp(this, &AnimationNodeBlendTreeEditor::_popup_request));

editor/animation/animation_blend_tree_editor_plugin.h

@@ -111,6 +111,7 @@ class AnimationNodeBlendTreeEditor : public AnimationTreeNodeEditorPlugin {
 
 	void _scroll_changed(const Vector2 &p_scroll);
 	void _node_selected(Object *p_node);
+	void _node_deselected(Object *p_node);
 	void _open_in_editor(const String &p_which);
 	void _anim_selected(int p_index, const Array &p_options, const String &p_node);
 	void _delete_node_request(const String &p_which);

editor/animation/animation_state_machine_editor.cpp

@@ -284,6 +284,11 @@ void AnimationNodeStateMachineEditor::_state_machine_gui_input(const Ref<InputEv
 			}
 		}
 
+		// If no state or transition was selected, select host StateMachine node.
+		if (selected_node.is_empty() && selected_transition_index == -1) {
+			EditorNode::get_singleton()->push_item(state_machine.ptr(), "", true);
+		}
+
 		state_machine_draw->queue_redraw();
 		_update_mode();
 	}
@@ -1648,6 +1653,10 @@ void AnimationNodeStateMachineEditor::_erase_selected(const bool p_nested_action
 
 		connected_nodes.clear();
 		selected_nodes.clear();
+		selected_node = StringName();
+
+		// Return selection to host StateMachine node.
+		EditorNode::get_singleton()->push_item(state_machine.ptr(), "", true);
 	}
 
 	if (selected_transition_to != StringName() && selected_transition_from != StringName() && state_machine->has_transition(selected_transition_from, selected_transition_to)) {
@@ -1668,8 +1677,12 @@ void AnimationNodeStateMachineEditor::_erase_selected(const bool p_nested_action
 		selected_transition_from = StringName();
 		selected_transition_to = StringName();
 		selected_transition_index = -1;
+
+		// Return selection to host StateMachine node.
+		EditorNode::get_singleton()->push_item(state_machine.ptr(), "", true);
 	}
 
+	_update_mode();
 	state_machine_draw->queue_redraw();
 }