Keybindings in companion windows

[alexluigit]

Isn't preview in a separate window? If so closing the preview and then
pressing q again to close dirvish should be fine or not? For the other
Emacs modes that's the way the closing mechanism works.

PS: Since you closed this issue, should we open another one for the
keybindings in the preview frame?

Originally posted by @Thaodan in #270

Dirvish restores user's original window configuration after pressing q in the main (root) window, I guess this should also work for preview window as well, as the preview would stop updating once the preview window gets removed. Alternatively, we can bind remap q to other-window locally, which just focus back to the main window.

Another way to handle this would be allowing dirvish-quit (q) command work on all dirvish windows (including root, preview and other misc windows).

[Thaodan]

Sounds sensible to me.

[alexluigit]

I'm pinning this issue for a while. If you or anyone have suggestions for commands to bind for these special buffers, please share them here.