D10232: Include a pixel more in the dirty area

[Marco Martin]

mart created this revision.
mart added reviewers: Plasma, Konsole.
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REVISION SUMMARY
  withfractional scaling sometimes there are visual glithches
  in rendering.
  painting areas of the terminal is heavily based on QRegion
  which is all integer, and sometimes rounding errors can happen
  this mitigates the problem, ensuring an area big enough gets
  updated when repainting partial areas that cover eventual
  pixel fractions that were rounded away
  CCBUG:373232

TEST PLAN
  most of the visual glitches are gone now, a missing pixel line
  in the background very rarely still happening but seems a separate issue
  somewhere else in the painting code

REPOSITORY
  R319 Konsole

BRANCH
  phab/dirty

REVISION DETAIL
  https://phabricator.kde.org/D10232

AFFECTED FILES
  src/TerminalDisplay.cpp

To: mart, #plasma, #konsole
Cc: plasma-devel, ZrenBot, ngraham, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, hindenburg, sebas, apol, mart
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