D25362: Don't add and remove player element if it is already in the page

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, fvogt, tasossahanidis.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  In case the player has genuinely been added to the website as visible player control.
  
  CCBUG: 411742

TEST PLAN
  - Wikipedia player works again: https://en.wikipedia.org/wiki/File:Thunder.ogg
  - All of the test cases in D24870 <https://phabricator.kde.org/D24870> still work

REPOSITORY
  R856 Plasma Browser Integration

REVISION DETAIL
  https://phabricator.kde.org/D25362

AFFECTED FILES
  extension/content-script.js

To: broulik, #plasma, fvogt, tasossahanidis
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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