[bug #37186] Mouse wheel scrolling is slow

[Riccardo Mottola]

Follow-up Comment #3, bug #37186 (project gnustep):

I will try to compare the same application on Mac, although I often use a
trackpad there.

I too noticed that there is some "slowness", but sometimes. For example if I
use ProjectCenter and am inside an editor, I do a single scroll tick and just
about one line scrolls up.
If I open a text tocument in Ink it scrolls by the same amount, a bit less
than one line in the standard Font

Things seem to vary quite a bit. i was comparing Seamonkey browser (Firefox)
between X11/GTk and Windows7 and I see they scroll differently. although in
any case the amount is much larger.

I checked Cocoa's NSEvent doc:
NSScrollWheel
The user manipulated the mouse’s scroll wheel. Use the NSEvent methods
deltaX, deltaY, and deltaZ to find out how much it moved. If the mouse has no
scroll wheel, this event is never generated.

How is this delta calculated? I couldn't find evidence.

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