set Vue to 2.5.17 and use watcher-based optimizations on responsive window mixin

[indirectlylit]

In #4065 we're setting vue to a beta version for testing. It's very important that we upgrade vue to 2.5.17 final before release 0.11.0

check version on npm page

[indirectlylit]

According to the releases page, 2.5.17:

is a hot fix that ... does NOT include any changes from 2.5.17-beta.0

Looks like they had an emergency security fix, and those beta changes will come in 2.5.18?

[indirectlylit]

also, by committing 34edbc4 we are no longer testing the beta

[DXCanas]

A little confused by this issue @indirectlylit, as 2.5.18 still hasn't been released?

[indirectlylit]

Darn. I'd hoped it would have been released by now.

I upgraded because we need the performance improvements in vuejs/vue#7824

Unfortunately that change caused a regression: vuejs/vue#8446

I'll need to make a performance update to work around this

[DXCanas]

@devon Is there a specific component that was causing issues?

[indirectlylit]

Yes it was an optimization in the responsive window mixin, where the computed props were being re-calculated constantly during resizes rather than just at breakpoint thresholds.

I think we'll basically need to revert this commit: 355acf3