[mqtt] Trigger channels created in .things file are not shown as such in Mailn UI #19583

The way to create a triggering MQTT/Generic channel in a .things file, as described at https://www.openhab.org/addons/bindings/mqtt.generic/, is to put [… trigger="true"] in the configuration. The way to create a triggering channel over Main UI for MQTT/Generic is to select as Type “trigger” (instead of Number, Text(String), On/Off Switch). Exporting to DSL of a triggering channel, created over Main UI, shows Type trigger:. The way to describe a triggering channel in a .things file, foreseen in Thing.xtext, is to start a channel line with

Trigger Switch :

instead of

Type switch : [… trigger="true"]

or instead of

Type trigger :

Trigger channels setup over a .things file with trigger="true" are not shown as such in Main UI: in Main UI it is not clear whether this is a State or Trigger channel. Using the form Trigger Switch: in a .things file emits a message “Channel … has no type” from org.openhab.binding.mqtt.generic.internal.handler/GenericMQTTThingHandler.java:initialize().

• Accept the syntax Trigger Switch: for mqtt generic thing channel when reading .things file.
• Show in MainUI in a distict way triggering and state channels, irrespective of whether the triggering channel was configured using Type trigger:, Type switch : [trigger="true"] or Trigger Switch: form.

I am using openHAB 5.1 build 4865.