Problem: The behavior of the visual search mappings aren't consistent
with their normal mode counterparts.
- The count isn't considered
- Searching with an empty selection will match every character in the
buffer
- Searching backwards only jumps back when the cursor is positioned at
the start of the selection.
Solution:
- Issue `n` `v:count1` times
- Error out and exit visual mode when the selection is empty
- Detect when the cursor is not at the start of the selection, and
adjust the count accordingly
Also, use the search register instead of the more error-prone approach
of feeding the entire search string as an expression
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