D19674: [Icon Item] Also clear image icon when using Plasma Svg

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
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REVISION SUMMARY
  When changing an `IconItem` from using a local image (e.g. PNG file) to using a Plasma themed icon, the implicit size wasn't updated since the old image was still loaded in `m_imageIcon`. Clearing it when clearing the other icon stores fixes this.
  
  BUG: 405298

TEST PLAN
  - Changed kickoff icon to be a rectangular image, reset it back to default, button size updated correctly

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D19674

AFFECTED FILES
  src/declarativeimports/core/iconitem.cpp

To: broulik, #plasma
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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