D27460: fix layout size hints for button labels

[Marco Martin]

mart created this revision.
mart added a reviewer: Plasma.
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REVISION SUMMARY
  icon sizes and label placements tested correct in  several scenarios
  
  - control.icon.width/height is used as maximum size of the icon
  - if the button is smaller icons always scale down
  - icons stay ccentered regardless of button size when there is no text

TEST PLAN
  fixes icon sizes without workarounds like D27260 <https://phabricator.kde.org/D27260>

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/buttonslayout

REVISION DETAIL
  https://phabricator.kde.org/D27460

AFFECTED FILES
  src/declarativeimports/plasmacomponents3/Button.qml
  src/declarativeimports/plasmacomponents3/TabButton.qml
  src/declarativeimports/plasmacomponents3/ToolButton.qml

To: mart, #plasma
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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