D7726: Fix ignoring of certain popup windows by the windowmapper

[Fabian Vogt]

fvogt created this revision.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  At least on vivaldi 1.11, plasma-browser-extension broke popups
  as the windowmapper page replaced the entire content and the popup
  closed itself shortly thereafter.
  Those popups have type === "normal", but the JSON-encoded extData
  field has a windowType member that contains the truth...

TEST PLAN
  Without this, google hangouts is broken. With this, google hangouts
  works again.

REPOSITORY
  R856 Plasma Browser Integration

BRANCH
  popupfix

REVISION DETAIL
  https://phabricator.kde.org/D7726

AFFECTED FILES
  extension/extension.js

To: fvogt, broulik, davidedmundson
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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