Merge pull request #2731 from ControlSystemStudio/CSSTUDIO-1976

CSSTUDIO-1976 Escape newlines in TextField "text" to prevent newlines from being removed in Label widgets.

app/display/editor/src/main/java/org/csstudio/display/builder/editor/properties/PropertyPanelSection.java

@@ -563,7 +563,7 @@ else if (property instanceof MacroizedWidgetProperty)
                         final MacroizedWidgetProperty<?> other_prop = (MacroizedWidgetProperty<?>) w.getProperty(macro_prop.getName());
                         undo.execute(new SetMacroizedWidgetPropertyAction(other_prop, result.get()));
                     }
-                    text.setText(result.get());
+                    text.setText(result.get().replaceAll("\n", "\\\\n"));
                     Tooltip.install(text, new Tooltip(result.get()));
                 });
                 field = new HBox(text, open_editor);