Leak fixes

addons/block_code/block_code_node/block_code.gd

@@ -4,7 +4,6 @@ class_name BlockCode
 extends Node
 
 @export var block_script: BlockScriptData = null
-static var plugin
 
 
 func _ready():
@@ -31,10 +30,6 @@ func _enter_tree():
 		new_bsd.generated_script = new_bsd.generated_script.replace("INHERIT_DEFAULT", new_bsd.script_inherits)
 		block_script = new_bsd
 
-	if plugin == null:
-		plugin = ClassDB.instantiate("EditorPlugin")
-		plugin.add_inspector_plugin(load("res://addons/block_code/inspector_plugin/block_script_inspector.gd").new())
-
 
 func _update_parent_script():
 	if Engine.is_editor_hint():

addons/block_code/block_code_plugin.gd

@@ -6,6 +6,9 @@ const MainPanel := preload("res://addons/block_code/ui/main_panel.tscn")
 static var main_panel: MainPanel
 static var block_code_button: Button
 
+const BlockInspectorPlugin := preload("res://addons/block_code/inspector_plugin/block_script_inspector.gd")
+var block_inspector_plugin: BlockInspectorPlugin
+
 var editor_inspector: EditorInspector
 var editor_selection: EditorSelection
 
@@ -52,6 +55,8 @@ func _enter_tree():
 	main_panel = MainPanel.instantiate()
 	main_panel.undo_redo = get_undo_redo()
 	block_code_button = add_control_to_bottom_panel(main_panel, _get_plugin_name())
+	block_inspector_plugin = BlockInspectorPlugin.new()
+	add_inspector_plugin(block_inspector_plugin)
 
 	# Remove unwanted class nodes from create node
 	old_feature_profile = EditorInterface.get_current_feature_profile()
@@ -71,6 +76,8 @@ func _enter_tree():
 
 
 func _exit_tree():
+	remove_inspector_plugin(block_inspector_plugin)
+
 	if block_code_button:
 		remove_control_from_bottom_panel(main_panel)
 		block_code_button = null
@@ -155,7 +162,8 @@ func select_block_code_node(block_code: BlockCode):
 
 
 func _refresh_block_code_node():
-	main_panel.switch_block_code_node(_selected_block_code)
+	if main_panel:
+		main_panel.switch_block_code_node(_selected_block_code)
 
 
 func _on_selected_block_code_changed():

addons/block_code/inspector_plugin/block_script_inspector.gd

@@ -10,7 +10,7 @@ func _parse_begin(object):
 
 	var button := Button.new()
 	button.text = "Open Block Script"
-	button.pressed.connect(func(): BlockCodePlugin.main_panel.switch_script(block_code))
+	button.pressed.connect(func(): BlockCodePlugin.main_panel.switch_block_code_node(block_code))
 
 	var container := MarginContainer.new()
 	container.add_theme_constant_override("margin_bottom", 10)

addons/block_code/ui/picker/categories/block_category.gd

@@ -1,5 +1,5 @@
 class_name BlockCategory
-extends Object
+extends RefCounted
 
 var name: String
 var block_list: Array[Block]