Release 1.26.5 (sass#987)

This needs a release because the release process for 1.26.4 was broken
by dart-lang/sdk#41259.

Avoid adding duplicate modules when importing forwarded stylesheets (s…

…ass#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.

Fix a check that prevents compiling .css files to themselves (sass#968)

Co-Authored-By: Natalie Weizenbaum <[email protected]>

Refactor Extender._extendOrReplace() (sass#965)

This combines all targets into a single extender invocation, which is
more efficient and allows it to more aggressively do redundant
selector elimination.

Merge pull request sass#962 from sass/watch-bug

Fix a --watch bug

Temporarily disable deploying to Chocolatey (sass#960)

The cli_pkg Chocolatey deployment is still failing for unknown
reasons, and until I have time to debug it I want to get a full
release out.

Cut a release (sass#958)

* Use cli_pkg's updated Chocolatey support
* Stop running Node tests on the Dart dev channel for now

See dart-lang/test#1184

Cut a release (sass#957)

Merge pull request sass#948 from sass/release

Cut a release

Create a release to test cli_pkg infrastructure (sass#940)