Hi everyone,
I've developed a patch which solves the scrolling issue on "OS X".
I assume that there have been different scrolling issues but the one I'm
referring to is the one diagnosed by Stephan Witt
> (LyX developer list 18 may 2011, Stephan Witt)
> It isn't a bug, it's a feature. Qt4.7 renders most fonts with kerning and
> ligatures as hinted by the font designers.
> LyX assumes fixed character width without kerning and so Qt draws the text
> different then LyX is positioning the cursor.
> That's why if LyX is linked with Qt4.7 the drawing is done character by
> character - the cursor positioning is ok then
> but the misspelled markers looks horrible because the dotted line is drawn
> for
> every single character too.
The only way to get more or less decent scrolling is to disable the
\force_paint_single_char setting, but then the cursor positioning is
wrong. This is caused by LyX calculating the width of text by adding the
single width of all characters.
The patch disables the character by character painting (in
rowpainter.cpp) and adapts the cursor positioning routines (in
TextMetrics.cpp) so that the width is calculated word by word in the
same way as Qt does the painting.
Since I found the scrolling issue really annoying, others might also be
interested.
I use the patched LyX2.1 daily without problems, but of course I'm
limited to a particular type of document (text + equations + graphics)
and I did not test it on another platform.
I tried to keep compatibility with RTL languages, but did not check this
very thoroughly.
Tests where done with the LyX2.1 version as of 27 january 2013.
Regards,
P. De Visschere
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