__fish_prepend_sudo: Don't move the relative position of the cursor #6542
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Description
At the moment the "prepend sudo" (Alt-S) functionality always sets the cursor to the end of the line. This changes it to restore the relative position of the cursor.
The functionality was added in #6140 (0f802ea). The PR description says "This does not move the cursor", which suggests that the current behaviour is a mistake.
For example, let's say the user entered
ls /root
and then moved the cursor to, e.g.where | is the cursor position. Running the function currently turns it to
whereas after this change it is
TODOs: