Bug report: scrolling with trackpad unintentionally zooms

Summary:

Due to how zoom and scroll are implemented on Mac OS, a scroll may unintentionally turn into a zoom. This happens many times a day for me. I like to turn this behaviour off.

Just a few observations:

• In Opera, scrolling is achieved by moving two fingers up or down on a trackpad. I think this is generic Mac OS behaviour (it works in all applications)
• In Opera, scrolling is achieved by moving two fingers up or down on a trackpad while simultaneous holding down the option/alt key. I think this is Opera-specific behaviour (it does not work in other applications).
• This problem is reproduced on Mac OS 10.10.5 with Opera 42.0.2393.94, with mouse gestures and advanced keyboard shortcuts turned OFF.

Steps to reproduce:

• Use two finger on a trackpad on a Mac to scroll up ro down on a lengthy page.
• Observe that once you release your fingers, the scrolling continues for a few moments until it slows down and stops. This is gerneric Mac OS behaviour (it works in all applications)
• During those moments, press down the option/alt key

Expected behaviour:
I would have expected that the scrolling would come to a stop, regardless of my keypress.

Actual behaviour:
As soon as I press the option/alt key =, the “residual” scroll movement aborts and is turned into a zoom behaviour.

The above happens a LOT to me. I seem to have a habit of opening a few tabs, scroll through the page, quickly navigate two another tab using command—option-arrow shortcut.