bug#43308: 28.0.50; Improvements to Edit->Search menu

[Juri Linkov]

> (I used to have nonincremental items at top level,
> but moved them to a submenu because their use is
> less common now.  Admittedly, if someone uses this a
> lot then accessing via submenu is less efficient.)

Why no keybindings are shown for nonincremental menu items?
They still have keybindings, e.g. nonincremental forward search
can be started with 'C-s RET', nonincremental backward search
with 'C-r RET', nonincremental regexp search 'C-M-s RET', etc.