send abstract method
Broadcast signalPaths from this viewer (source) to all others.
source identifies the originating viewer (e.g. 'waveform',
'schematic'). LocalCrossProbeService uses this tag to filter
out its own broadcasts so it does not receive its own selections as
incoming signals.
Does nothing when isActive is false or signalPaths is empty.
Implementation
void send(List<String> signalPaths, {required String source});