Add Ctrl / Shift fine grain support for equalizer sliders

[thepragmaticmero]

When I press Shift or Ctrl + scrollwheel, the slider should move in 0.10 increments and even 0.01 increments.
Kooha-2024-09-18-06-50-49.webm
My idea is 0.10 steps by default, Ctrl for 0.01 increments and Shift for 1.0 increments.
Onshape has a good implementation of this.
Kooha-2024-09-18-06-49-28.webm

UI/UX
Note: I know that it could be done with the Up and Down arrow keys, but scrolling seems more natural for such sliders.

[violetmage]

GTK sliders already have a precision function: clicking and holding on the slider knob without moving it will cause it to "balloon" after a moment. Then, in this mode, the distance of mouse movements is scaled down to allow for more precision.

[thepragmaticmero]

just like my 2018 sonic search history. Tnks I didn't knew that.