Mouse context menu (right click) does not containt copy/paste/cut when source view is scrolled

At the source code when the scroll bar is placed at top, context option box able to show copy and paste option. When moved to bottom or anywhere in middle the context option box does not show copy and paste option.

Workaround

Use the keyboard shortcuts cmd/ctrl + c to copy code to the clipboard.

Environment:

Ubuntu 14.04
Java 8

Expected Result:

To allow the context option box to have copy and paste option throughout the source code from top to bottom.

Actual Result:

Does not have copy and paste option in the context option box.

Screenshot:
When scroll bar at top:

When scroll bar not at top: