use all available option strings when setting value

this fixes where tag values of fields with referenced strings can become corrupted when the sub-field has restricted `options`, and an unavailable option is entered manually into the field.

important for openstreetmap/id-tagging-schema#891

Author: tyrasd

CHANGELOG.md

@@ -46,6 +46,7 @@ _Breaking developer changes, which may affect downstream projects or sites that
 * Fix `multi/many/semiCombo` options for not being selectable immediately after removing them for fields with predefined options
 * Fix a bug where the _Add_ input element on comboboxes with a fixed set of allowed options is still hidden after an option of a previously "fully saturated" field is removed
 * Fix wrongly flagged "incorrect geometry type" warnings for features with lifecycle-prefixed tags ([#9483], thanks [@biswajit-k])
+* Fix corruption of tag values of fields with referenced strings, but restricted `options`, when an unavailable option is entered manually into the field.
 #### :earth_asia: Localization
 * Send `Accept-Language` header on Nominatim API calls ([#9501], thanks [@k-yle])
 * Add Address and Phone Format for India ([#9482], thanks [@biswajit-k])

modules/ui/fields/combo.js

@@ -73,7 +73,7 @@ export function uiFieldCombo(field, context) {
     function tagValue(dval) {
         dval = clean(dval || '');
 
-        var found = getOptions().find(function(o) {
+        var found = getOptions(true).find(function(o) {
             return o.key && clean(o.value) === dval;
         });
         if (found) return found.key;
@@ -171,11 +171,17 @@ export function uiFieldCombo(field, context) {
         }
     }
 
-    function getOptions() {
+    function getOptions(allOptions) {
         var stringsField = field.resolveReference('stringsCrossReference');
         if (!(field.options || stringsField.options)) return [];
 
-        return (field.options || stringsField.options).map(function(v) {
+        let options;
+        if (allOptions !== true) {
+            options = field.options || stringsField.options;
+        } else {
+            options = [].concat(field.options, stringsField.options).filter(Boolean);
+        }
+        return options.map(function(v) {
             const labelId = getLabelId(stringsField, v);
             return {
                 key: v,