right click on a file with underlying show "Open link File:..."

Sometime the regex that find url in the terminal thinks the line is a URL while it is not.

It is an old bug bug fixing it without breaking quick open etc is tricky.

The problem is that is involve context menu shows `Open link " File:..."` for example while the "found" url is wrong.

To fix: add a check "if startswith("http?:") just before building the context menu