bug#52293: [External] : bug#52293: 29.0.50; [PATCH v3] Prevent further cases of duplicated separators in context menus

[Juri Linkov]

> If someone does want to use the mouse for selecting
> and deleting text, Emacs's mouse-3 behavior is great.

Not great, but bizarre.  No other app uses such method
because of its limitations: while the currently default `mouse-3'
only kills selected text, using the context menu from `mouse-3'
allows to select more operations on the region -
kill the region without adding it to the kill ring,
kill the region with adding it to the kill ring,
add the region to the kill ring without killing it,
replace the region by pasting other text, etc.