Disable auto-link when pasting over a text

[javierarce]

If I copy a URL, highlight a text to link it, and paste the URL, the plugin replaces my selection with the link which means that I then need to go and rewrite the title. This is super annoying.

A better approach would be for the plugin to respect the selection and use it instead of the fetched title.

[electblake]

+1

[neoromantic]

Came here to write a feature request exactly for this.

Basically, we want to be able to insert a link over existing title (we wrote).

Currently, it's either do not use auto-link plugin, settle with need to rewrite a link always, or (what I do) have a separate hotkey to insert an empty link on selected text and paste URL in it (which works, but cumbersome).

Ideal solution would be:

1. have a toggle in settings "replace selection with fetched title on link paste/ preserve selection as title on link paste"
2. former one is current behavoir (so, no users are baffled by the change)
3. latter is new: when you paste URL on selection, no fetch needed, link is simply added.

[neoromantic]

I've created a quick PR with a solution. Would appreciate if you approve it (or ask for any changes, if needed)