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 SelectAllActionHandler() {
            super(IDEWorkbenchMessages.TextAction_selectAll);
            setId("TextSelectAllActionHandler");
            setEnabled(false);
            PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
					IIDEHelpContextIds.TEXT_SELECT_ALL_ACTION);
        }
        public void runWithEvent(Event event) {
            if (activeTextControl != null && !activeTextControl.isDisposed()) {
                activeTextControl.selectAll();
                updateActionsEnableState();
                return;
            }
            if (selectAllAction != null) {
                selectAllAction.runWithEvent(event);