Don't error when transposing a single character #45420
Merged
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This fixes an issue where an error would be thrown in the REPL if you tried to transpose an input that was a single character while your cursor was to the right of that character (e.g., "A|"). To fix this, let's move left once before we check for if we're at the start of a line. This does change behavior slightly in that the cursor can move left once without actually transposing anything, but this seems to match what Emacs does with M-x transpose-chars in an equivalent situation.
Fixes #45417.