[LinuxCNC/linuxcnc Issue#284] Axis: Inconsistent jog from manual tab

Here are the steps I follow to reproduce the issue:

1. In sim/axis_mm.ini set
[TRAJ] COORDINATES = X Z A
[KINS] KINEMATICS = trivkins coordinates=xza
Rename [AXIS_ ] sections to X Z A.
2. Start the config, power on the machine
3. Select axis A from the list and jog it with + – buttons.

This is what I expected to happen:

Selected axis marker remains in place. Selected axis jogs and stops.

This is what happened instead:

Marker moves from A to Z.
Axis A starts jogging but doesn’t stop!

Keyboard jog looks OK.

It worked properly before this:

Trivkins is different in 2.7 so I did not try that.

Information about my hardware and software:

* I am using Debian image.
* I am running a binary I built myself from source.
* I am using this LinuxCNC version v2.8.0-pre1-3169-gdf1c3ba