**System Information**
Operating system: Darwin-19.6.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 455 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.10.18
**Blender Version**
Broken: ..., 2.79b, 2.92.0 Alpha
**Short description of error**
In the Sequencer, unnecessary horizontal grid lines are drawn at a position equal to fps.
{F9538924}
The vertical timelines are drawn by `UI_view2d_constant_grid_draw` with fps increments.
Since this function draws a grid, it also creates unnecessary horizontal lines.
**Exact steps for others to reproduce the error**
- Set the FPS to `24.5`, to see clearly.