vim:keys: Substitute only inside visual selection

When substituting in a visual block selection, the automatically
inserted range `'<,'>` is not enough as the pattern will also match
outside of the selection on the same lines. To only match inside the
selection, insert the `\%V` atom.

Theoretically the pattern will also need the atom before the last
character to make sure that everything is inside the selection, but this
can be inserted manually when needed (see `:h /\%V`).

.config/vim/vimrc.d/40-keys.vim

@@ -27,13 +27,13 @@ nnoremap <C-w>! <C-w>T
 " Substitute command
 if (exists('+inccommand') && &inccommand != '')
 	nnoremap S :%s/
-	vnoremap S :s/
+	vnoremap S :s/\%V
 else
 	" This does not work with live previewing commands (inccommand) since the
 	" replace pattern is already defined and thus everything matching the search
 	" pattern is just deleted.
 	nnoremap S :%s//gc<Left><Left><Left>
-	vnoremap S :s//gc<Left><Left><Left>
+	vnoremap S :s/\%V/gc<Left><Left><Left>
 endif
 
 " Interact with the system clipboard