Lightmorphic Flow 0.6.3
Pre-release
Beta. This is the one that makes crossing work.
The pointer bounced straight back
The desktop's log said it plainly: pointer moved to T14s, then in the very same second T14s has gone quiet — bringing the pointer back, then disconnected, then reconnected, over and over.
The safety check I added in 0.6.1 — bring the pointer home if the other machine stops answering — started its clock when that machine connected, and only reset it when the machine sent something. A machine sitting there not being used sends nothing. So by the time you pushed the pointer across, it had already been silent for longer than the limit and was declared dead on arrival.
Now every connected machine is pinged whether or not it is in use, and the clock is reset the moment the pointer arrives.
The flickering tray icon
The tray repainted its icon and asked the system for its state every nine tenths of a second. It now repaints only when the icon actually changes, and asks at most every five seconds.
Installing
sudo apt install ./lightmorphic-flow_0.6.3_all.deb
On both machines.
More at flow.lightmorphic.com.