On Thu, 18 Jan 2024 11:09:12 GMT, Prasanta Sadhukhan <[email protected]> wrote:
> Lines are left behind when moving the scrollbar in the positive direction. > but are cleaned up on mouse release. > Additonally, with right arrow clicks too, the lines are left behind. > Seems like for mouseDragged and scrollByUnit, the dirty region of the > scrollbar is not repainted leading to artifacts > which is being done in this fix.. However, I don't quite understand how repainting helps. I could understand if you enlarged the rectangle along the orientation axis by 1 pixel in either direction, this would ensure any fractional pixels would always be repainted. Is this bug similar to [JDK-8032219](https://bugs.openjdk.org/browse/JDK-8032219)? src/java.desktop/share/classes/javax/swing/plaf/basic/BasicScrollBarUI.java line 1192: > 1190: scrollByUnits(scrollbar, direction, 1, false); > 1191: Rectangle r = getTrackBounds(); > 1192: scrollbar.repaint(r.x, r.y, r.width, r.height); Suggestion: scrollbar.repaint(getTrackBounds()); ------------- PR Review: https://git.openjdk.org/jdk/pull/17484#pullrequestreview-1837060367 PR Review Comment: https://git.openjdk.org/jdk/pull/17484#discussion_r1462226407
