Properly fix discard changes breaking UI

Author: UnsignedArduino

gui.py

@@ -428,6 +428,21 @@ def open_create_new_project(self) -> None:
  self.create_new_project_buttons()
  self.new_project_frame.wait_window()
 
+ def clear_recent_projects(self) -> None:
+ """
+ Clear the recent projects.
+
+ :return: None.
+ """
+ logger.debug("Clearing recent projects...")
+ if mbox.askokcancel("CircuitPython Project Manager: Confirm",
+ "Are you sure you want to clear all recent projects?"):
+ logger.debug("Clearing all recent projects!")
+ self.save_key("opened_recent", [])
+ self.update_recent_projects()
+ else:
+ logger.debug("User canceled clearing all recent projects!")
+
  def update_recent_projects(self) -> None:
  """
  Update the opened recent projects menu.
@@ -445,6 +460,9 @@ def update_recent_projects(self) -> None:
  command=lambda path=path: self.open_project(path))
  if len(self.recent_projects) == 0:
  self.opened_recent_menu.add_command(label="No recent projects!", state=tk.DISABLED)
+ self.opened_recent_menu.add_separator()
+ self.opened_recent_menu.add_command(label="Clear recent projects", command=self.clear_recent_projects,
+ state=tk.DISABLED if len(self.recent_projects) == 0 else tk.NORMAL)
 
  def create_file_menu(self) -> None:
  """
@@ -838,7 +856,7 @@ def discard_modified(self) -> None:
  return
  try:
  logger.debug("Discarding all changes!")
- self.make_main_gui()
+ self.update_main_gui()
  except FileNotFoundError:
  logger.exception("Uh oh, an exception has occurred!")
  self.close_project()
@@ -915,6 +933,7 @@ def update_main_gui(self) -> None:
 
  :return: None.
  """
+ self.disable_closing = True
  self.update_menu_state()
  logger.debug("Updating main GUI...")
  self.destroy_all_children(widget=self.main_frame)
@@ -926,12 +945,15 @@ def create_main_gui(self) -> None:
 
  :return: None.
  """
+ logger.debug(f"self.cpypmconfig_path: {repr(self.cpypmconfig_path)}")
  if self.cpypmconfig_path is None:
+ logger.info("No project is open!")
  ttk.Label(
  master=self.main_frame,
  text="No project is open! Use the file menu to create\na new project or open an existing project!"
  ).grid(row=0, column=0, sticky=tk.NW)
  else:
+ logger.info("Project is open - (re)loading everything!")
  logger.debug(f"Parsing {repr(self.cpypmconfig_path)}")
  self.cpypmconfig = json.loads(self.cpypmconfig_path.read_text())
  self.make_title(self.cpypmconfig["project_name"])
@@ -941,6 +963,7 @@ def create_main_gui(self) -> None:
  self.make_file_sync_buttons()
  ttk.Separator(master=self.right_frame, orient=tk.HORIZONTAL).grid(row=3, column=0, padx=1, pady=1, sticky=tk.NW + tk.E)
  self.make_save_and_sync_buttons()
+ self.disable_closing = False
 
  def make_main_gui(self, cpypmconfig_path: Path = None) -> None:
  """