Fix text selection when forusing text inputs

Fix text selection when forusing text inputs

When using one of the `f` commands to focus a text input, the previous selection
or caret position should be retained, just as if you had clicked it. However,
before this commit all of their text was accidentally selected (as if you had
pressed `<tab>` to foucs).

This also improves the `gi` command. Previously, it _always_ selected all text.
Now it does so only if you use a count, or use `gi` to re-focus an input after a
prevented autofocus. In those cases you likely want to replace what's in the
input, but otherwise you're likely returning to the text input after a temporary
leave and want to continue typing where you left off.