commit (HEAD): more smart shaping stuff

From: Tomas Frydrych (tomasfrydrych_at_yahoo.co.uk)
Date: Fri Nov 28 2003 - 09:09:35 EST

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added virtual void fp_Run::updateOnDelete(offset, lentgth) which is
used inside of fl_BlockLayout::_delete(...) instead of just calling
fp_Run::setLength(). The implementation in the base class simply maps
to setLength() call, but fp_TextRun::updateOnDelete() does extra
pocessing to avoid unnecessary calls to
UT_contextGlyph::renderString(); the result of these and other recent
changes is that we are making substantially fewer calls to the
shaping engine.

I also fixed a problem in fp_TextRun::_clearScreen()

files: fp_Run.h/cpp, fp_TextRun.h/cpp, fl_BlockLayout.cpp

Tomas

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