Free StopWatch 4.0.0.0, some Pixels of painting crap in the drop-down-menu

Reproduction steps

• install Free StopWatch 4.0.0.0 from rapps
• select from menubar the options-tab
• expand the languages submenu, if you like scroll a bit

Observed result
some pixels of painting crap on the left side of that submenu
0.4.14-RC-98-gc437ff6_affected.webm
0.4.14-RC-98-gc437ff6_affected.log is useless, nothing is logged during that interaction

Expected result
no painting crap
2k3sp2_leftSideOk.webm