Project Structure Window serious usability flaws and bugs.

Hello,

yesterday I ran through a somewhat serious problem using PyCharm, which I decided to report now, after sleeping over it.

I tried to change the Content Root Setting for my current project within the Project Structure window. The window is split into two parts (left a directory view + right a content root-list).

Here comes the problem: I was about to remove the Content Root entry under my cursor on the right side using the keyboard Delete Button (OSX; above the return key).

But what actually happened: It removed the selected directory on the left pane from the disk instead. No questions asked. It also teared down any PyCharm instance I had running. They just completely stalled. 

There are several Problems:
- I do not want to delete a directory in that view ever (I have i trillion other ways to do it)
- I do want to get a question before deleting files
- I do want deleted files to be moved into the trash of the OS (this is what it is for)
- I do not want PyCharm to tear itself and all its instances down
- I do want to be able to undo such an inconvenient operation

Given the consequences there I consider this a serious bug; There are multiple ways to handle it. The least of this would be to have a Confirmation-Dialog and a non-crashing Interface.

However, I could recover from the situation (after I calmed down, though): Given I knew the directory structure and the files I changed since the last commit, I could recreate the directories by hand and from there I could use the local history to restore the files piece by piece.

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