Feedback wanted on two recent changes

Hello,

I recently made a few changes to Gwenview for which I would like to have 
your feedback:

# Centering and smooth scrolling in the thumbnail bars
(I saw Ilya already commented about it, will reply)
The idea is to try to keep the current item centered in the thumbnail 
bar, this way you always get to see what's coming next. The problem is 
that if you click an item, it magically "jumps" to the center location, 
which is a bit surprising. To work around this, I added a smooth 
scrolling effect, which progressively scrolls the item to the center to 
avoid the abrupt jump.
The current scrolling time is 250 milliseconds. I wanted a longer time, 
but it conflicted with the loading of the image: Gwenview starts to load 
the image while the item is moving, which causes slowdown. The scrolling 
is not smooth at all anymore. It would be nice to have your feedback 
because I think this behavior varies depending on your machine power.
An alternative could be to start loading the image only after the item 
has been centered.

# View mode keyboard shortcuts
I added support for easily switching between view modes from the keyboard:
- "Return" key gives you more details: browse -> view -> fullscreen
- "Escape" key gives you less details: fullscreen -> view -> browse
How do you feel about these shortcuts?

Aurélien

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