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1.26.4

@nex3 nex3 tagged this 24 Mar 22:31
…#973)

Avoid adding duplicate modules when importing forwarded stylesheets

In Google stylesheets that imported import-only stylesheets with many
forwards many of times, we were seeing Environment._globalModules grow
large enough that variable accesses were a problem. This addresses
that in several ways:

* Forwarded modules are now ignored if the module is already being
  forwarded.

* Module equality is more intelligent, so that shadowed and forwarded
  modules can be effectively de-duplicated.

* If a module would be fully shadowed by a later import *and* that
  module has no CSS, we no longer add an empty ShadowedModule to the
  module list.
Assets 2