In 'xfce4-menueditor', all items can be right-clicked on to be removed/edited.
However, for some reason, '- separators -' cannot be right-clicked on. Because
of this, the only way to delete them is using the delete button at the top of
the window (which I did not notice at first because I was used to using the
right-click menus).

Reproducible: Always
Steps to Reproduce:
1. Open 'xfce4-menueditor'
2. Find/create a separator you do not need.
3. Attempt to right-click on the separator. Note that you cannot right-click.
4. Click the '-' symbol at the top while the separator is selected. Note that it
is successfully deleted.
Actual Results:  
The separator was deleted after the '-' button was used.

Expected Results:  
n/a