Operating system: Darwin-17.2.0-x86_64-i386-64bit 64 Bits
Graphics card: NVIDIA GeForce GTX 1050 Ti OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-10.27.6 322.214.171.124.20.109
Broken: version: 2.80 (sub 72), branch: master, commit date: 2019-05-23 20:37, hash: rBb3f96da2e605
Short description of error
When you have a strip in channel 1 of the VSE and you also have markers enabled.
The marker area covers the bottom channel. More noticeable when the window is scaled vertically.
Exact steps for others to reproduce the error
Add some markers.
Add a strip into channel 1 of the VSE.
Scale the window vertically and this strip will be covered by the marker area,
(short video attached)