bug#45536: [PATCH] Pretty-print keys without <> around modifiers

[Mattias Engdegård]

It is a bit inconsistent that keys are described as C-x and <return> but 
<C-return>. It would be more logical to write C-<return>. The key parser will 
happily accept either, but descriptions without modifiers in <> brackets are 
more legible, and the result is easier to understand and explain.

Attached is a patch which adapts the code that pretty-prints keys. This is a 
change for human consumption only; it seems unlikely to affect compatibility. 
With the patch, <C-M-backspace> is now printed as C-M-<backspace>.

I'd be happy to update the manuals accordingly, and add a NEWS entry if 
required.

0001-Pretty-print-keys-without-around-modifiers.patch
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