Just a question about adding a pair of curly braces using "C-c {":
If I don't select a region, it is normal to add the braces at the
cursor's place.
When I selected a region, and applied this key combination to this
region, however, it will add the {} at the end of the region instead
of embracing this region. Any special reason for this or it is a bug?
No. It simply hasn't been implemented, although I think it would be
useful. Does anybody know a command in Emacs which already does
something like this?
Any key combination to delete an extra pair of braces?
What is an extra pair of braces? Something like \foo{bar}{} or
something like {{foo}}?