D13768: Modernize View Properties window

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: Dolphin, elvisangelaccio, broulik.
ngraham requested review of this revision.

REVISION SUMMARY
  Like D12571 <https://phabricator.kde.org/D12571>, but for the View Properties Window. This allows us to use a `QFormLayout` as the top-level layout and simplify the code a lot, including no longer using the now-unnecessary paradigm of putting a layout inside a `QWidget`.

TEST PLAN
  Window still resizes properly when the Additional Information content is shown or hidden.
  
  Global view properties, additional information hidden:
  
  Global view properties, additional information shown:
  
  Per-folder view properties, additional information hidden:
  
  Per-folder view properties, additional information shown:

BRANCH
  modernize-view-properties-window (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D13768

AFFECTED FILES
  src/settings/viewpropertiesdialog.cpp

To: ngraham, #dolphin, elvisangelaccio, broulik
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