Prevent typeahead results getting lost on form submit (#1112)

Submitting a form triggers a global click, which closes our overlay. For inputs, the overlay only opens on focusin, so it doesn't come back unless the user blurs and focuses again. This ensures that the overlay always comes back.

frontend/src/lib/overlay/index.ts

@@ -113,12 +113,16 @@ class OverlayTarget implements ActionReturn<OverlayParams> {
     if (!this.contentElem) throw new Error('Overlay target must have a child with class "overlay-content"');
     this.contentElem.remove();
 
-    this.useInputConfig = this.targetElem.matches('input') || !!this.targetElem.querySelector('input');
+    const inputElem = this.targetElem.matches('input') ? this.targetElem : this.targetElem.querySelector('input');
+    this.useInputConfig = !!inputElem;
 
     if (this.useInputConfig) {
       this.targetElem.addEventListener('focusin',
         () => !this.isActive() && this.openOverlay(),
-        {signal: this.abortController.signal});
+        { signal: this.abortController.signal });
+      inputElem?.addEventListener('input',
+        () => !this.isActive() && this.openOverlay(),
+        { signal: this.abortController.signal });
       this.targetElem.addEventListener('focusout',
         () => {
           // When clicking on an element in the content, the focus first goes to the body and only then to the element.