[rt10000] Imprecise/inconsistent rendering of items

[avasiloaie]

There are some inconsistencies in the spacing of the timeline items. It seems that, depending on the size of the timeline element, sometimes there is an additional space/gap visible.

From the demo, margin removed with inspector to be more visible, more space between items:

Same as above, the timeline is sized just slightly larger, but there is less space:

They are not especially visible in the demo because they are mostly spread around and come with a default margin of 3 pixels, but end up looking quite glitchy if I would want to have consecutive items with the same end/start and no margin.

The case described above:

Here it is not visible:

But here it is visible even for the background, without any modifications: