Widget expressions: Add # as a shorthand for item.numericState (#2441)

Refs openhab/openhab-core#4123.

Signed-off-by: Jimmy Tanagra <[email protected]>

bundles/org.openhab.ui/web/src/components/widgets/widget-mixin.js

@@ -20,13 +20,17 @@ expr.jsep.plugins.register(jsepRegex, jsepArrow, jsepObject, jsepTemplate)
 
 expr.addUnaryOp('@', (itemName) => {
   if (itemName === undefined) return undefined
-  const itemState = store.getters.trackedItems[itemName]
-  return itemState.displayState || itemState.state
+  const item = store.getters.trackedItems[itemName]
+  return item.displayState || item.state
 })
 expr.addUnaryOp('@@', (itemName) => {
   if (itemName === undefined) return undefined
   return store.getters.trackedItems[itemName].state
 })
+expr.addUnaryOp('#', (itemName) => {
+  if (itemName === undefined) return undefined
+  return store.getters.trackedItems[itemName].numericState
+})
 
 dayjs.extend(relativeTime)
 dayjs.extend(calendar)