Merge branch 'staging' into parser-followup-2

public/scripts/autocomplete/AutoComplete.js

@@ -761,8 +761,10 @@ export class AutoComplete {
         }
         // autocomplete shown or not, cursor anywhere
         switch (evt.key) {
+            // The first is a non-breaking space, the second is a regular space.
+            case ' ':
             case ' ': {
-                if (evt.ctrlKey) {
+                if (evt.ctrlKey || evt.altKey) {
                     if (this.isActive && this.isReplaceable) {
                         // ctrl-space to toggle details for selected item
                         this.toggleDetails();
@@ -770,6 +772,8 @@ export class AutoComplete {
                         // ctrl-space to force show autocomplete
                         this.show(false, true);
                     }
+                    evt.preventDefault();
+                    evt.stopPropagation();
                     return;
                 }
                 break;

public/scripts/autocomplete/AutoCompleteOption.js

@@ -147,6 +147,11 @@ export class AutoCompleteOption {
                 }
                 li.append(specs);
             }
+            const stopgap = document.createElement('span'); {
+                stopgap.classList.add('stopgap');
+                stopgap.textContent = '';
+                li.append(stopgap);
+            }
             const help = document.createElement('span'); {
                 help.classList.add('help');
                 const content = document.createElement('span'); {