D29352: [Plasmoid Heading] Draw the heading only when there is an SVG in the theme

[Filip Fila]

filipf created this revision.
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REVISION SUMMARY
  We're the only theme with the appropriate heading svgs that make the headers and footers look as they should.
  
  All the other themes fall back to Breeze, which is not a good look for some of them:
  
  - the heading is too jarring compared to applet background
  - the heading does not extend all the way vertically and horizontally
  
  To solve this, to avoid degrading unmaintained themes and to give themes a chance to adjust on their own terms, this patch makes the heading visible only when the needed SVG exists in the theme.

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  heading-only-if-svg-exists (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D29352

AFFECTED FILES
  src/declarativeimports/plasmaextracomponents/qml/PlasmoidHeading.qml

To: filipf
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
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