function atLeastOneDescendantEditable(oReferenceOverlay, aChildOverlays) {
		var bAtLeastOneChildEditable = aChildOverlays.some(function(oOverlay) {
			return oOverlay.getEditable() && oOverlay.getGeometry();
		});

		if (bAtLeastOneChildEditable) {
			return true;
		}

		var aChildrensChildrenOverlays = [];
		aChildOverlays.forEach(function(oChildOverlay) {
			aChildrensChildrenOverlays = aChildrensChildrenOverlays.concat(OverlayUtil.getAllChildOverlays(oChildOverlay));
		});

		if (!aChildrensChildrenOverlays.length) {
			return false;
		}
		if (childrenAreSameSize(oReferenceOverlay, aChildrensChildrenOverlays)) {
			return atLeastOneDescendantEditable(oReferenceOverlay, aChildrensChildrenOverlays);
		}
		return false;
	}
Checks all the decendants for an editable child. Stops as soon as an editable is found
or the children don't have the same size anymore.

@param {sap.ui.dt.ElementOverlay} oReferenceOverlay - overlay object
@param {sap.ui.dt.ElementOverlay[]} aChildOverlays - array of child overlay objects
@returns {boolean} Returns true if there is an editable descendant
@private