[TreeView] Trigger focus on Ctrl + C / V

[oliviertassinari]

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

The active focus on a tree view shifts when pressing Ctrl+C.

Expected Behavior 🤔

The active focus is left unchanged. Same as https://www.w3.org/TR/wai-aria-practices/examples/treeview/treeview-2/treeview-2b.html. I believe we should ignore all keyboard combinations.

Steps to Reproduce 🕹

Steps:

1. Load https://material-ui.com/components/tree-view/#basic-tree-view
2. Open "Application"
3. Ctrl+C

Context 🔦

I was working on http://material-ui.com/customization/default-theme/#explore, trying to copy a value.

Your Environment 🌎

Tech	Version
@material-ui/lab	v4.0.0-alpha.46

[igorbrasileiro]

I was reproducing the bug above and I think I found another.

Steps to Reproduce 🕹

Steps:

1. Load basic-tree-view
2. Open "Application"
3. Ctrl + C - will focus Calendar
4. Ctrl + C - will focus Chrome
5. Ctrl + C - will focus Calendar

Steps 3, 4, 5 will loop if press Ctrl + Cmultiple times