Run the check
Confirm in the exact device manual whether an angle-snapping switch exists; Logitech documents one for the G600 in Logitech Gaming Software, not for every mouse.
Draw the same slow diagonal in the comparison below with the option off, then change only that option and capture another real trace with it on.
Compare both traces alongside a repeat in the general mouse test, keeping surface, sensitivity and hand motion as similar as possible.
Official reference: Logitech G600 angle-snapping setting in device manual
Capture two real pointer paths
Use a mouse whose software actually exposes angle snapping. Set it outside this page, then draw a slow diagonal in the stage while holding the left button. Repeat after changing only that setting.
These are the points this browser received, not measured physical hand movement. A straighter path alone does not establish which setting caused it.
Read the result
A straighter second trace may be consistent with correction, but hand motion and operating-system pointer processing can also change its shape.
Limits and next step
The browser sees pointer coordinates after device and system processing; it cannot read firmware settings or certify that angle snapping caused a difference.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.