Use list-package-dirs rather than symlinks in the analyzer

[nex3]

Pub is planning on no longer producing package symlinks (issue #15103), but currently the analyzer relies on these symlinks to resolve "package:" imports. Ultimately it would be good for the analyzer to look up packages through barback, but until then it should use "pub list-package-dirs" to find the dependency paths so pub can safely cease producing symlinks.

[nex3]

Marked this as blocking #15103.

[bwilkerson]

Pub is planning on no longer producing package symlinks ...

De we have a time-frame for when this will likely happen?

[nex3]

Do we have a time-frame for when this will likely happen?

It's blocked on this issue, but we'd like to do it as soon as we can without breaking the ecosystem. It's the third most-starred pub issue.

[bwilkerson]

Added this to the 1.6 milestone.
Removed Type-Enhancement, Priority-Unassigned labels.
Added Type-Defect, Priority-High, Analyzer-Command labels.

[sethladd]

Marked as High, assigning owner. If I get this wrong, please help me by:

* assigning a new owner

• changing priority
• changing milestone

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Set owner to @danrubel.

[sethladd]

Anything we can do to remove symlinks is a good thing.

[bwilkerson]

Added Started label.

[danrubel]

Implemented behind a flag in editor, but not tested so not enabled by default
https://codereview.chromium.org/439933005/

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Removed this from the 1.6 milestone.
Added this to the 1.7 milestone.

[munificent]

Woo!

[bwilkerson]

Removed this from the 1.7 milestone.
Added this to the 1.8 milestone.

[nex3]

What's the status on this? Is it going to be enabled by default soon?

[danrubel]

Not ready for 1.8

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Removed this from the 1.8 milestone.
Removed Priority-High label.
Added Priority-Medium, Triaged labels.

[bwilkerson]

Set owner to @pq.