DVT SystemVerilog IDE User Guide
Rev. 20.1.13, 22 May 2020
Right click in the current editor > Copy Full Path.
You can also assign it a shortcut: go to Window > Preferences > General > Keys (or press twice ctrl + shift + L ) and assign a shortcut to Copy Full Path. It's a global shortcut, you can call it from anywhere but only the active editor's input will be considered (or the current selection in the navigator if you call it when the navigator view is active e.g. after you select a file).