Bug 180758 [IDE] Deleting a project but not the contents asks if you want to delete read-only files
I have noticed that in 3.3M6, if I delete a project that has read-only files in it, it will prompt if I want to delete the files even if I select "Do not delete contents". The files are not actually deleted, but the error dialog should not be presented to the user since the files are not actually being deleted. I don't remember seeing this in 3.3M4 or earlier.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/actions/DeleteResourceAction.java
deleteContent = (button == radio1);
				}
			}
		};
		boolean getDeleteContent() {
			return deleteContent;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.jface.window.Window#open()
		 */
		public int open() {
			
			if (fIsTesting) {
				deleteContent = true;
				return Window.OK;
			}
			return super.open();
		}
		/**
		 * Set this delete dialog into testing mode. It won't pop up, and it
		 * returns true for deleteContent.
		 * 
		 * @param t
		 *            the testing mode
		 */
		void setTestingMode(boolean t) {
			fIsTesting = t;
		}