This change is a bit delicate as there's quite a few states to be in: remote files selected, a file inside trash, trash itself, link to trash on the desktop, readonly directory, etc
* Made my desktop folder read-only (requires D15161 to work properly)
* Paste, Cut, Rename options were disabled, Trash option was hidden
* In trash:/ "Delete" and "Empty Trash" showed up fine
* Some options that make no sense for trash (Rename, "Create New") are hidden, like in Dolphin
* Pressing Delete, F2, Ctrl+X, etc do nothing when the actions are disabled
Together with D15160 this allows locking down the desktop for the user when you make the desktop folder read-only