Search expression to match only "leaf" notes

[bobrippling]

• I have searched for existing issues that may be the same as or related to mine.

If I have notes such as:

* Shopping :shopping:
** Bread
** Veg
*** Carrots
*** Cabbage

Where I've grouped some items, I'd like to find all "leaf" items, and ignore the groups. In other words, items without children, so in this case, Bread, Carrots and Cabbage.

Would a change to add a leaf search expression be accepted? If so I can create a PR. It would be something like:

t.shopping leaf
or
t.shopping hierarchy.leaf / t.shopping h.leaf if we wanted to avoid the "leaf" bareword being by itself