_getFieldHelpDisplayMapping() {
			const mControlIDToDisplayControlID = {};
			for (const sControlID in this.mDocuRefControlToFieldHelp) {
				const oControl = Element.getElementById(sControlID);
				if (!oControl) { // control has been destroyed, cleanup internal data structure
					delete this.mDocuRefControlToFieldHelp[sControlID];
					continue;
				}

				let sFieldHelpDisplayControlId;
				let oTempControl = oControl;
				do {
					sFieldHelpDisplayControlId = oTempControl.getAssociation("fieldHelpDisplay")
						|| oTempControl[BindingInfo.OriginalParent]?.getId();
					oTempControl = oTempControl.getParent();
				} while (!sFieldHelpDisplayControlId && oTempControl);
				if (sFieldHelpDisplayControlId) {
					mControlIDToDisplayControlID[sControlID] = sFieldHelpDisplayControlId;
				}
			}
			return mControlIDToDisplayControlID;
		}
Iterates over the internal data structure for all controls which have field help information and
checks whether the field help for that control has to be displayed at another control, e.g. an
input field in a table has to show the field help information at the table column header. It checks the
<code>fieldHelpDisplay</code> association or the <code>sap.ui.base.BindingInfo.OriginalParent</code>
symbol at the control and in the control's parent hierarchy. If the internal data structure contains
outdated references, they are cleaned up.

@returns {Object<string, string>}
  Maps a control ID having a field help information to the control ID at which it shall be displayed