Fix custom install path behaviour

[neclimdul]

Fixes #26

[ivantcholakov]

I tried this correction, it worked with Composer version 2.0.7:

    public function getLocations()
    {
        return [ '' => false ];
    }

Edit: Works on Composer 2.0.8 too.

[exteon]

Bump, I need to fix the same issue here

[zaporylie]

Any chance to get this into tagged release? This is the only blocker for all my projects to fully immerse into composer 2 and for some reason patch is not applied (with cweagans/composer-patches) before the issue occurs when composer 2 is in use, however patching works when composer 1 is in use. I suspect some issue with plugin weights.

[neclimdul]

I think this hasn't been merged because there was a suggestion for a slightly different approach on the main issue. A slightly deeper change to how things work that I haven't had time to rationalize and modify this merge.

#26 (comment)

If someone wants to do that might get things moving again.

[syzygy333]

#26 (comment)