Wait for Package Control to re-enable installed packages (#305)

Package Control disables packages while installing them and re-enables
them afterwards. The helper killed Sublime Text as soon as the packages
and libraries were installed, which could leave them in ignored_packages,
so that the tests started without them.

Author: rchl

actions/setup/install_package_control_helper.py

@@ -74,6 +74,9 @@ def check_packages():
         manager = package_control.package_manager.PackageManager()
         settings = sublime.load_settings("Package Control.sublime-settings")
         missing_packages = set(settings.get("installed_packages", [])) - manager.list_packages()
+        # Takes the lock that PC holds while re-enabling packages, so that
+        # `ignored_packages` is saved too once a package is no longer listed.
+        missing_packages |= package_control.package_disabler.PackageDisabler.in_process_packages()
         if not missing_packages:
             check_libraries()
             return