Remove the thumnail-only view from the filesystem dock

[groud]

@akien-mga and @reduz, you should be happy now ! ^^

(sorry, the mouse bugged)

Closes #23041

[capnm]

Edit: The title line is really shocking ;-)

[ghost]

What does this do? I went and toggled the split view in an older build and one with this commit, and I'm not sure what is different.

[groud]

This only removes the the view previously accessed via double-clicking on a folder from the no-split mode.

The split mode with thumbnails at the bottom is still present.

[ghost]

Ah I see. Thanks for clarifying. The title line is a little worrying. XD

I had not yet ever activated that mode until just now. I'm in splits mode 99% of the time, because the larger thumbnails are faster for me in most situations.

But seeing it now, I can easily imagine how one might accidentally invoke it a lot from being a little too fast on their clicks. When I tried it for the first time, it also took a minute to discover there was a little tree icon to switch it back.