After taking the screenshot, the Save dialog obstructed the corrupt part of the window, and after the dialog disappeared the window was rendered correctly again. Anything that causes a re-render (obstruct and re-raise window, or select text) will restore proper rendering.
After taking the screenshot, the Save dialog obstructed the corrupt part of the window, and after the dialog disappeared the window was rendered correctly again. Anything that causes a re-render (obstruct and re-raise window, or select text) will restore proper rendering.