Default mouse wheel scrolling is jumpy

[Simen Heggestøyl]

Hi. I find the default value of `mouse-wheel-scroll-amount'

mysterious. Jumping 5 lines at the time per scroll event (plus more

when `mouse-wheel-progressive-speed' is enabled, which it is by

default) makes the scrolling feel very "nervous". It's also hard for

the eyes to follow the text when it makes such big jumps.

It's especially bad in the cases where it's hard to control each

scroll event, such as with laptop touchpads or with ThinkPad-style

trackpoints. Then I find the default scrolling mechanism next to

unusable.

Does anyone else feel the same way? If more people agree with this, I

propose setting the default scroll amount to 2, or maybe even 1. I

also find that the progressive scroll speed functionality contributes

to this "nervous" scroll feeling, and I propose turning that off by

default as well.

This will make scrolling Emacs behave more similar to other

applications, and I think it will provide a more pleasant scrolling

experience.

-- Simen