Smooth scrolling in code view

[mkurdej]

A nice to have: ability to change in preferences how many lines a mouse roll scrolls.
Current scrolling seems quite slow to me (and it seems to "jump", i.e. not being continuous).

[egraether]

@mkurdej Should the scrolling speed affect scrolling everywhere in the app, or just scrolling in the code view, or just scrolling vertically in the code view?

[mkurdej]

I'll say that in the 1st iteration, it may be a global setting for the whole app. If a need be, it may be detailed in the future, what do you think?

[egraether]

Implemented scroll speed setting with 0.7.1.38

Added a scroll speed multiplier to the preferences that changes the QScrollBar::singleStep for code, graph and search views. It seems that the singleStep field is ignored in graph and search view however, at least on my Mac.

The scrolling is still jagged and should change speed according to scroll amounts.

[mkurdej]

Nice! Thank you.