Save as Dialog for unsaved projects that were changed during exiting the application. (#350)

* Make it possible to save changed projects on closing the application, even if they were not saved before.

* Fixed issue with cancel file dialog

* Removed unused line

Author: tafode

lorien/Main.gd

@@ -28,6 +28,8 @@ var _exit_requested := false
 var _dirty_project_to_close: Project = null
 var _player_enabled := false
 
+signal file_dialog_finished
+
 # -------------------------------------------------------------------------------------------------
 func _ready() -> void:
 	# Init stuff
@@ -407,7 +409,9 @@ func _on_save_project_as() -> void:
 	_file_dialog.current_file = active_project.filepath.get_file()
 	_file_dialog.file_selected.connect(_on_file_selected_to_save_project)
 	_file_dialog.close_requested.connect(_on_file_dialog_closed)
+	_file_dialog.canceled.connect(_on_file_dialog_canceled)
 	_file_dialog.popup_centered()
+	await file_dialog_finished
 
 # -------------------------------------------------------------------------------------------------
 func _on_save_project() -> void:
@@ -418,20 +422,26 @@ func _on_save_project() -> void:
 		_file_dialog.invalidate()
 		_file_dialog.file_selected.connect(_on_file_selected_to_save_project)
 		_file_dialog.close_requested.connect(_on_file_dialog_closed)
+		_file_dialog.canceled.connect(_on_file_dialog_canceled)
 		_file_dialog.popup_centered()
 	else:
 		_save_project(active_project)
+# -------------------------------------------------------------------------------------------------
+func _on_file_dialog_canceled() -> void:
+	file_dialog_finished.emit()
 
 # -------------------------------------------------------------------------------------------------
 func _on_file_dialog_closed() -> void:
 	_file_dialog.disfile_selected.connect(_on_file_selected_to_save_project)
 	_file_dialog.disclose_requested.connect(_on_file_dialog_closed)
+	file_dialog_finished.emit()
 
 # -------------------------------------------------------------------------------------------------
 func _on_file_selected_to_save_project(filepath: String) -> void:
 	var active_project: Project = ProjectManager.get_active_project()
 	active_project.filepath = filepath
-	_save_project(active_project)
+	await(_save_project(active_project))
+	file_dialog_finished.emit()
 
 # -------------------------------------------------------------------------------------------------
 func _on_canvas_background_changed(color: Color) -> void:
@@ -456,7 +466,12 @@ func _on_tool_changed(tool_type: int) -> void:
 # -------------------------------------------------------------------------------------------------
 func _on_save_unsaved_changes() -> void:
 	if _exit_requested:
-		ProjectManager.save_all_projects()
+		for project in ProjectManager.get_open_projects():
+			ProjectManager.make_project_active(project)
+			if project.filepath.is_empty() && project.loaded && project.dirty:
+				await(_on_save_project_as())
+			elif !project.filepath.is_empty() && project.loaded && project.dirty:
+				await(_on_save_project())
 		_save_state()
 		get_tree().quit()
 	else: