D21642: use even more resizing

[Harald Sitter]

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REVISION SUMMARY
  since the widget by default has no strings in the designer ui file any
  state change injects stuff in qlabels and changes the effective size hint.
  to deal with this once and for all the three state changes now always
  call a new adjustment helper.
  the adjustment helper calls adjustSize iff the hintted dimensions are
  larger than the effective one. this way we don't shrink the window
  when the backtrace is reloaded, but always grow it if needed for the
  backtraced state.
  
  CHANGELOG: The Developer Information tab now correctly resizes to fit the content
  FIXED-IN: 5.16.1
  BUG: 406748

TEST PLAN
  - no cut off widgets when going to dev info tab while bt is generated
  - neither when the bt is loaded
  - doesn't shrink when clicking reload

REPOSITORY
  R871 DrKonqi

BRANCH
  Plasma/5.16

REVISION DETAIL
  https://phabricator.kde.org/D21642

AFFECTED FILES
  src/backtracewidget.cpp
  src/backtracewidget.h

To: sitter
Cc: plasma-devel, LeGast00n, ericadams, jraleigh, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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