show empty tag values in multi-selections

data/core.yaml

@@ -725,6 +725,7 @@ en:
     wiki_reference: View documentation
     wiki_en_reference: View documentation in English
     key_value: "key=value"
+    empty: (empty)
     multiple_values: Multiple Values
     multiple_types: Multiple Types
     unshared_value_tooltip: not shared by all features

modules/ui/combobox.js

@@ -403,7 +403,7 @@ export function uiCombobox(context, klass) {
                     if (d.display) {
                         d.display(d3_select(this));
                     } else {
-                        d3_select(this).text(d.value);
+                        d3_select(this).text(d.title);
                     }
                 })
                 .on('mouseenter', _mouseEnterHandler)

modules/ui/sections/raw_tag_editor.js

@@ -411,7 +411,13 @@ export function uiSectionRawTagEditor(id, context) {
                 .fetcher(function(value, callback) {
                     var keyString = utilGetSetValue(key);
                     if (!_tags[keyString]) return;
-                    var data = _tags[keyString].filter(Boolean).map(function(tagValue) {
+                    var data = _tags[keyString].map(function(tagValue) {
+                        if (!tagValue) {
+                            return {
+                                value: ' ',
+                                title: t('inspector.empty'),
+                            };
+                        }
                         return {
                             value: tagValue,
                             title: tagValue
@@ -549,6 +555,9 @@ export function uiSectionRawTagEditor(id, context) {
         // exit if this is a multiselection and no value was entered
         if (typeof d.value !== 'string' && !this.value) return;
 
+        // remove tag if it is now empty
+        if (!this.value.trim()) return removeTag(d3_event, d);
+
         // exit if we are currently about to delete this row anyway - #6366
         if (_pendingChange && _pendingChange.hasOwnProperty(d.key) && _pendingChange[d.key] === undefined) return;