Issue #4625: If IDLE cannot write to its recent file or breakpoint

files, display a message popup and continue rather than crash.
(original patch by Roger Serwy)

Lib/idlelib/EditorWindow.py

@@ -799,12 +799,17 @@ class EditorWindow(object):
         rf_list = [path for path in rf_list if path not in bad_paths]
         ulchars = "1234567890ABCDEFGHIJK"
         rf_list = rf_list[0:len(ulchars)]
-        rf_file = open(self.recent_files_path, 'w',
-                        encoding='utf_8', errors='replace')
         try:
-            rf_file.writelines(rf_list)
-        finally:
-            rf_file.close()
+            with open(self.recent_files_path, 'w',
+                        encoding='utf_8', errors='replace') as rf_file:
+                rf_file.writelines(rf_list)
+        except IOError as err:
+            if not getattr(self.root, "recentfilelist_error_displayed", False):
+                self.root.recentfilelist_error_displayed = True
+                tkMessageBox.showerror(title='IDLE Error',
+                    message='Unable to update Recent Files list:\n%s'
+                        % str(err),
+                    parent=self.text)
         # for each edit window instance, construct the recent files menu
         for instance in self.top.instance_dict:
             menu = instance.recent_files_menu

Lib/idlelib/PyShell.py

@@ -206,14 +206,22 @@ class PyShellEditorWindow(EditorWindow):
                 lines = fp.readlines()
         except IOError:
             lines = []
-        with open(self.breakpointPath, "w") as new_file:
-            for line in lines:
-                if not line.startswith(filename + '='):
-                    new_file.write(line)
-            self.update_breakpoints()
-            breaks = self.breakpoints
-            if breaks:
-                new_file.write(filename + '=' + str(breaks) + '\n')
+        try:
+            with open(self.breakpointPath, "w") as new_file:
+                for line in lines:
+                    if not line.startswith(filename + '='):
+                        new_file.write(line)
+                self.update_breakpoints()
+                breaks = self.breakpoints
+                if breaks:
+                    new_file.write(filename + '=' + str(breaks) + '\n')
+        except IOError as err:
+            if not getattr(self.root, "breakpoint_error_displayed", False):
+                self.root.breakpoint_error_displayed = True
+                tkMessageBox.showerror(title='IDLE Error',
+                    message='Unable to update breakpoint list:\n%s'
+                        % str(err),
+                    parent=self.text)
 
     def restore_file_breaks(self):
         self.text.update()   # this enables setting "BREAK" tags to be visible