show tag reference info for the currently filled-in tag value, closes #9786

CHANGELOG.md

@@ -39,6 +39,7 @@ _Breaking developer changes, which may affect downstream projects or sites that
 
 #### :tada: New Features
 #### :sparkles: Usability & Accessibility
+* Show tag reference information for the currently filled-in tag value in UI fields (if available), instead of only showing the more generic _key_ documentation of the field ([#9786])
 #### :scissors: Operations
 #### :camera: Street-Level
 #### :white_check_mark: Validation
@@ -53,6 +54,7 @@ _Breaking developer changes, which may affect downstream projects or sites that
 #### :hammer: Development
 
 [#8997]: https://github.com/openstreetmap/iD/issues/8997
+[#9786]: https://github.com/openstreetmap/iD/issues/9786
 
 
 # 2.26.2

modules/ui/field.js

@@ -204,7 +204,11 @@ export function uiField(context, presetField, entityIDs, options) {
                         referenceKey = referenceKey.replace(/:$/, '');
                     }
 
-                    reference = uiTagReference(d.reference || { key: referenceKey }, context);
+                    var referenceOptions = d.reference || {
+                        key: referenceKey,
+                        value: _tags[referenceKey]
+                    };
+                    reference = uiTagReference(referenceOptions, context);
                     if (_state === 'hover') {
                         reference.showing(false);
                     }