Bug 239518 [Contributions] Fix up TextActionHandler's handling of Delete to use Text.insert
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/actions/TextActionHandler.java
protected CutActionHandler() {
            super(IDEWorkbenchMessages.Cut);
            setId("TextCutActionHandler");
            setEnabled(false);
            PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
					IIDEHelpContextIds.TEXT_CUT_ACTION);
        }
        public void runWithEvent(Event event) {
            if (activeTextControl != null && !activeTextControl.isDisposed()) {
                activeTextControl.cut();
                updateActionsEnableState();
                return;
            }
            if (cutAction != null) {
                cutAction.runWithEvent(event);
                return;
            }
        }
        /**
         * Update state.
         */
        public void updateEnabledState() {
            if (activeTextControl != null && !activeTextControl.isDisposed()) {
                setEnabled(activeTextControl.getEditable() && activeTextControl.getSelectionCount() > 0);
                return;
            }