Re: Dark styles bounded by unexpected white lines

As mentioned on some of the issues, exposing Scintilla to the true pixel 
dimensions should allow this to be solved. There are likely Qt APIs to 
specify that the calling code is High-DPI aware and to retrieve scaling 
information.

If that is not possible, an overdraw technique could be tried. That would 
draw at least an extra logical pixel (as seen by Scintilla) at the bottom 
of each line. This should ensure the bottom physical pixel is completely 
painted but may also tint the following pixel. Drawing the next line may 
mix (blur) with the boundary pixel and completely paints the next pixel. 
Since it is drawing with the current colours (not a single global colour) 
this should adapt to situations where there are segments of the document 
with different background colours. It would only work for 
SC_PHASES_MULTIPLE and unbuffered drawing as other modes clip drawing to 
the line in logical pixels.

A scale below 100% may still cause problems as the next physical pixel may 
not be covered by a single logical pixel.

Drawing pixels twice will be less efficient and this addition would also 
increase the complexity of the drawing code.

Within each line, segment background drawing could also add an extra pixel 
to the right and that would work (just for the short vertical lines shown) 
even in SC_PHASES_TWO.

Neil

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