Fixes #1186 - support web/js files relocation

[rbayet]

To be introduced in 2.3.x and 2.2.7
With expected BC break in 2.2.x because magento/magento2#16582 does not seem to cover this particular case
See issue of origin magento/magento2#16302

[romainruaud]

Seems ok since I saw it working on your env.

Could you just do a quick scan of potential other issues like this in other modules ? As far as I can remember, there should not be any other cases, but I prefer to ensure it before merging and closing this PR.

[rbayet]

Could you just do a quick scan of potential other issues like this in other modules ? As far as I can remember, there should not be any other cases, but I prefer to ensure it before merging and closing this PR.

Already did, this was the only occurence of "variableName: 'Mage_module/path/to/js" in the suite modules' requirejs-config.js.

[romainruaud]

Great !

I merge this one.

It replaces #1187

Please @wouter-toppershops test this one by using the 2.6.x branch.

[wouter-toppy]

Thanks, will try

[wouter-toppy]

@rbayet it still gives the error on 2.3-beta.

[rbayet]

@wouter-toppershops hmmm yeah, the path mapping from old to new location has not been kept in 2.3.
If focused on the 2.2.x.
I'll revert the PR if I manage to have an hybrid version of the fix, both for 2.2.x and 2.3.