Update for delete confirm dialog

Hi,

So there are two reasons for this update:
1- When you select many files for delete, it is hard to click on the cancel option by mouse.
2- It is better to use a dialog instead of panel so it will follow Sublime principles.

ToDo:
1- If there were more than for example 3 files selected, we will only show the number of selected files, and no file path will be shown.
2- We will use ok_cancel_dialog instead of show_quick_panel here.

P.S. I can send a PR for this.

[math2001]

Hey Sina, I agree with your first point, but not with the second. I feel that the native cancel dialog feels kind of ugly, so that's why I choose to use this panel.

Go ahead an send a PR :-)

[TerminalFi]

I agree with the it being difficult to cancel but I also disagree with using a dialog.

Here are my thoughts:

1. Keep the file paths, I think it is valuable as if you have multi files named the same, you could see quickly if you selected the wrong one
2. Perhaps adding a option that if you type cancel into the dialog and hit ↩ then it would also cancel the delete
3. Can we add a file per line in the panel so that you can use the ↑ and ↓ to select individual files and hit ⌫ and have it be removed from the list and deleted on the sidebar

[TerminalFi]

Preview? Thoughts?

or including number of files

[math2001]

👌 very neat