Bug 298835 Merge e4 Project Path Variable back into the 3.6 stream
The virtual folder and filters changes are already in 3.6, the project path variable changes in e4 still remains to be merged.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/PathVariableDialog.java
newValidationStatus = IMessageProvider.ERROR;
            } else {
                allowFinish = true;
            }
        }
        
        
        if (validationStatus == IMessageProvider.NONE
                || newValidationStatus == IMessageProvider.ERROR) {
            validationStatus = newValidationStatus;
            validationMessage = message;
        }
         
        
        if (allowFinish == false) {
			setMessage(validationMessage, validationStatus);
		}
        return allowFinish;
    }
    /**
     * Validates the current variable value, and updates this dialog's message.
     * 
     * @return true if the value is valid, false otherwise
     */
    private boolean validateVariableValue() {
        boolean allowFinish = false;
        
        if (validationStatus == IMessageProvider.ERROR) {
			return false;
		}