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Fix huge painting artefact of certain dashed lines
The artefacts appeared for square-capped dashed pens when the end of the line fell a tiny fraction into the start of a new dash. At that point in the dashing algorithm, accumulated precision errors in the 'length' variable could make it slightly differ from the actual length between the start and end points of the line fragment. Although both values would be "almost zero", the rasterizeLine() function's square capping would make the error very visible; see the bug report. Fix by calculating the precise length of the last line fragment. Task-number: QTBUG-56969 Change-Id: I7b69c0d465649be61fb87ac7b8348f0c299486ee Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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