[FR] "Immitate" Picasa's Photo Viewer gestures (scroll between images when hovering the thumbs bar, mouse wheel zooming, etc)

Is your feature request related to a problem? Please describe.

Right now, you can use some "power" features, but IG still lacks some fair improvements that could be enhanced in future updates.

Describe the solution you'd like

I come from Picasa software and I really miss three features in IG:

1. Scrolling between images by hovering the thumbnails on the bottom and rolling the mouse wheel
2. Zoom in/out by hovering a certain region of the image and scrolling the mouse wheel. (Plus double-click to reset to center and window size.)
3. Transparent background (with glance).

Describe alternatives you've considered

I used Picasa for a long time in the past, so now I thought IG would be the best alternative, as far as I researched.

IfranView and XnView are very powerful resources, but the UX is quite bloated by default. So I liked the way IG is and I hope it keeps that way. So far, so good.

Picasa has great features indeed, but Google failed on dropping the support for it. And luckily I found your product.

I'm not saying that every single aspect of Picasa Photo Viewer should be literally copied, but you could certainly make some good use of what's already in it to implement and enhance IG even more.

Additional context

I started using IG thinking it would be like Picasa on steroids, and it really is. I really like the simple, clear and neat interface it has, but it still has lots to improve.
I'm glad enough to see future updates with nice features.

I work as a SysAdmin, so I'm thinking about installing IG on fresh installs of Windows and set it as the default image viewer.

For now, all I can do is to thank for the software, as it is really handy, since Google dropped Picasa's support.

I used Picasa for years and found this solution a few days ago, so now I'm relying on this to make sure it's going to work fine with newer machines.

Some customers still use Windows 7 and 8.1, for example, but I'll keep getting it to Windows 10 knowing the compatibility of your software is better for Windows 10 now.

Thanks for everything and keep up the good work. 👍🏻

Related issues (more details):

1. https://github.com/d2phap/ImageGlass/issues/953
2. https://github.com/d2phap/ImageGlass/issues/909
3. https://github.com/d2phap/ImageGlass/issues/886
4. https://github.com/d2phap/ImageGlass/issues/648
5. https://github.com/d2phap/ImageGlass/issues/595
6. https://github.com/d2phap/ImageGlass/issues/342
7. https://github.com/d2phap/ImageGlass/pull/294
8. https://github.com/d2phap/ImageGlass/pull/260
9. https://github.com/d2phap/ImageGlass/issues/974
10. https://github.com/d2phap/ImageGlass/issues/937
11. https://github.com/d2phap/ImageGlass/issues/435
12. https://github.com/d2phap/ImageGlass/issues/371
13. https://github.com/d2phap/ImageGlass/pull/378
14. https://github.com/d2phap/ImageGlass/issues/131

No files, tests, or entry points are named. Start by reviewing the related issues and pull requests listed in the report, especially #953, #909, #886, and #294, then trace the viewer's mouse-input handling. Done would require an agreed scope and validated behavior for thumbnail scrolling, hover zoom/reset, and the transparent background.