Mapping of item values not correctly shown in HABpanel

[ysc (Yannick Schaus)]

Hi, since this was a common and recurring issue, I finally resorted to query the API when an item’s state with a transformation applied changes.

Use and update transformed states in switch/dummy/template (#181)

Here’s a summary of the changes:

• There is an additional API query each time the item’s state is updated, but only when for items having a transformedState. If you have a frequent update on items with transforms you might experience some performance issues;
• Dummy widgets and switches display the transformed (i.e. mapped) state if available;
• The itemState (formerly itemValue) function in templates also now returns the transformed state by default, unless you set the new second parameter to true i.e. itemState('Item_With_Map', true). Use the raw state in conditions like ng-if without the transformation if possible.

Remember you need to have an openHAB version including @lolodomo’s PR, that is, snapshot 849 or newer.