fix drawing box chars, avoid storing and saving state all the time
Summary: to get the box chars to be drawn correctly we need to turn on high quality antialiasing in qpainter. in addition only turn it on if antialiasing is enabled. lastly qpainter.save()/restore() is called very often, so try to avoid that if it isn't necessary. BUG: 401463 Test Plan: `cat tests/boxes.txt` old: {F6428268} new: {F6450304} Reviewers: #konsole, hindenburg Reviewed By: #konsole, hindenburg Subscribers: wbauer, konsole-devel, #konsole Tags: #konsole Differential Revision: https://phabricator.kde.org/D16947
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e7a94574
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