D11606: [WebBrowser Plasmoid] Support opening external links

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, VDG.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  This implements a context menu for opening links externally. There is unfortunately currently no way to add custom context menu entries to `WebEngineView`'s context menu, so the link menu is completely replaced.
  It also lets websites open new windows and fixes `target="_blank"` links
  
  CCBUG: 371023

TEST PLAN
  F5763534: Screenshot_20180323_112038.png <https://phabricator.kde.org/F5763534>
  Verified that clicking a `<a href="file:///usr/bin/kate" target="_blank">` link does not result in that file being executed.
  Unwanted popups are successfully blocked and show a hint
  F5763531: Screenshot_20180323_111931.png <https://phabricator.kde.org/F5763531>

REPOSITORY
  R114 Plasma Addons

REVISION DETAIL
  https://phabricator.kde.org/D11606

AFFECTED FILES
  applets/webbrowser/package/contents/ui/main.qml

To: broulik, #plasma, #vdg
Cc: plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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