Scenegraph implementation of the rendergraph appears to have a geometry verticies upper limit

[acolombier]

The scenegraph rendergraph seems to only a support a certain number of vertices and drops any additional one silently, leading to a partial rendering of waveform. This problem is impacting vertice-heavy renderer such as the stem waveform, which overlay multiple signal waveform for each stems. It is not clear whether or not this limitation comes from a bug within our implementation, Qt SceneGraph or driver specific (tested on Linux 6.12.8 with NVidia 565.77 and Wayland 1.23.0).

An immediate remediation was to reduce the precision of the waveform precision and reduce the vertices count.

CC @m0dB who might have an idea of what is going on there!