Add signal for when the active project changes

lorien/Main.gd

@@ -238,16 +238,12 @@ func _on_files_dropped(files: PackedStringArray) -> void:
 
 # -------------------------------------------------------------------------------------------------
 func _make_project_active(project: Project) -> void:
-	var previous_project: Project = ProjectManager.get_active_project()
-
 	ProjectManager.make_project_active(project)
 	_canvas.use_project(project)
 
 	if !_menubar.has_tab(project):
 		_menubar.make_tab(project)
 	_menubar.set_tab_active(project)
-
-	_toolbar._on_active_project_changed(previous_project, project)
 
 # -------------------------------------------------------------------------------------------------
 func _is_mouse_on_ui() -> bool:

lorien/ProjectManager/ProjectManager.gd

@@ -1,8 +1,17 @@
 extends Node
 
 # -------------------------------------------------------------------------------------------------
+signal active_project_changed(previous_project: Project, current_project: Project)
+
 var _open_projects: Array[Project]
-var _active_project: Project
+
+var _active_project: Project:
+	set(value):
+		if _active_project == value:
+			return
+		var previous_project: Project = _active_project
+		_active_project = value
+		active_project_changed.emit(previous_project, _active_project)
 
 # -------------------------------------------------------------------------------------------------
 func read_project_list() -> void:

lorien/UI/Toolbar.gd

@@ -56,6 +56,7 @@ func _ready():
 	_tool_btn_line.pressed.connect(_on_LineToolButton_pressed)
 	_tool_btn_eraser.pressed.connect(_on_EraserToolButton_pressed)
 	_tool_btn_selection.pressed.connect(_on_SelectToolButton_pressed)
+	ProjectManager.active_project_changed.connect(_on_active_project_changed)
 
 # Button clicked callbacks
 # -------------------------------------------------------------------------------------------------