Changing readOnly doesn't affect relationship mode

[rsimon]

Not covered by PR #54 yet.

[rsimon]

Probably won't ever address this, since relationship mode is essentially marked for deprecation now, in favour of the upcoming Connections Plugin.

[apt-get2Update]

@rsimon I checked the code . If we add 'this.relationsLayer.readOnly = readOnly;' i see that it works as expected. but the documention says we should do that only from set mode.

set readOnly(readOnly) {
    this.selectionHandler.readOnly = readOnly;
    this.relationsLayer.readOnly = readOnly;
    // Note: relationsHandler.readOnly should be set by setMode.
    this.setState({ readOnly });
  }

Does it mean we should set Mode as Relations if readonly is set as false ?