D23295: [Tab Bar] Resolve tab icon lazily

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Dolphin.
Herald added a project: Dolphin.
Herald added a subscriber: kfm-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Calling `KIO::iconNameForUrl` will determine mime type of the file potentially blocking.
  Don't needless do it when the tab bar isn't visible.

TEST PLAN
  Browsed around, all was fine, opened a new tab, the icons were there just fine and updated properly

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D23295

AFFECTED FILES
  src/dolphintabwidget.cpp
  src/dolphintabwidget.h

To: broulik, #dolphin
Cc: kfm-devel, aprcela, vmarinescu, fprice, MrPepe, fbampaloukas, alexde, Codezela, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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