While holding down the Ctrl key a user can drag the cursor over a block of text to select it for text functions such as Cut, Copy & Paste.
In the Vivado 2016.1 Code Editor, the following incorrect behaviors have been found:
These issues are scheduled to be fixed in Vivado 2016.3.
Block selection, cutting, copying and pasting can still be used. However, users are advised be aware of these issues and to monitor results when pasting a block selection.