"expand" icon gets invisible on vertical button bar at dark mode

[sqa_wizard]

If I have a more items on vertical button bar than fitting on current size, an "expand" icon (tiny arrow down triangle) appears.
Pressing this button shows the remaining buttons as submenu [OK]

The icon on this button has a black colored line and is most likely transparent otherwise.
This shows up fine at normal mode.

The problem appears at dark mode.
Now this icon shows up as black line on black background, which turns it somehow invisible

May you can fill the tiny arrow with a light color to make it visible at dark mode too?

[ghisler(Author)]

Confirmed, I will try to find a solution.

[sqa_wizard]

Any idea to make it more visible?

[ghisler(Author)]

Thanks for the reminder, I didn't address this problem yet. I will use the dark mode foreground color instead.

[sqa_wizard]

Fixed in TC 10.0 final
The icon on this button has a light colored line at dark mode, which is well visible now.