BosWars 2.6.1 fullscreen explorer notification area flashes through

0.4.8-RC-14-g10b06f1 gcc dbg.
BosWars 2.6.1 from rapps.
VBox 4.3.40 without additions. VBEMP was used. No RAPPS but inbuilt Mesa.

First the goodnews:
We have an unexpected improvement for fullscreen in this app. In 0.4.7rls the taskbar was never in background. Now in 0.4.8-RC-14-g10b06f1 the taskbar is properly in background after a second.
Compare: 0.4.7rls.webm vs 0.4.8-RC-14-g10b06f1.webm
Does anyone have an idea which commit might have improved that? I think this is interesting to know, because we did never aim to fix that afaik.

Now the subtle remaining problem:
the icons in the taskbar notification area do still flash through sometimes when they update. see 0.4.8-RC-14-g10b06f1.webm , 0.4.8-RC-14-g10b06f1.log.

Reproduction steps:
-set desktop resolution to 800x600 32bit depth.
-start the game (it will startup windowed) and in options menu switch to fullscreen (leave 800x600)
-exit the game
-(here do both of my videos start)
-restart the game

Expected result:
-the icons in the notification area shall never flash through

Observed result:
-the icons in the notification area flash through now and then