Such lines are rendered by drawing a capless line that is pen-width
long, i.e. a square, to represent the two line caps. However, the line
length offset was added before any transformation, so one could end up
with a long line being rendered if the world transform had a large
scale, say.
Pick-to: 6.8
Change-Id: Idff8a2de54c97e35facc8f4e09c43dfea7397588
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
(cherry picked from commit 56de11397559af3b9694ef2b99d93a469889ae5e)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
8159f4626b