Modifier + scrollwheel for on-hover property change

[ChameleonScales]

First, I have to say a big thank you to everyone who contributed to this very powerful program. You're awesome!

Issue :

Currently, the mouse wheel is used for 2 actions at the same time : it both navigates up and down a window and changes properties if you hover over a spin box.
Because of this, accidental property change when trying to navigate the window is pretty much inevitable and it's only a matter of time before you do it without noticing.

Proposed solution :

Adding a modifier key to split the key binding.
For example, in Blender, Ctrl + scroll changes a spin property and scroll alone navigates the window. This way we don't have to worry about accidentally screwing things up.

[DelazJ]

Because of this, accidental property change when trying to navigate the window is pretty much inevitable

I thought this was fixed by #4274

[ChameleonScales]

I just tested on QGIS 3.12 and I don't see this 1 second rule take effect.
For example I enter a layer's style properties and scroll down. As I hit the bottom, the scrolling instantly switches to modifying the property my cursor is over.

In any case, using a modifier key would simply be safer and more efficient. The more confident you can be about using your mouse, the faster and more comfortably you can work. Knowing that if I scroll a fraction of a second too late I might change a value makes me more hesitant about using the wheel so I end up using the bars.

Generally, the concept of sharing a key binding and implement an obscure timed switch to partially split that binding doesn't seem like a great UX design decision to me.

[github-actions]

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