try workaround for Safari not properly handling Enter on the filter form

frontend/src/AutocompleteInput.svelte

@@ -4,7 +4,11 @@
   import { keyboardShortcut } from "./keyboard-shortcuts";
   import { fuzzyfilter, fuzzywrap } from "./lib/fuzzy";
 
-  const dispatch = createEventDispatcher();
+  const dispatch = createEventDispatcher<{
+    blur: HTMLInputElement;
+    enter: HTMLInputElement;
+    select: HTMLInputElement;
+  }>();
 
   export let value: string;
   export let suggestions: string[];
@@ -62,12 +66,10 @@
 
   function keydown(event: KeyboardEvent) {
     if (event.key === "Enter") {
-      if (index > -1 && !hidden && filteredSuggestions[index]) {
+      const suggestion = filteredSuggestions[index]?.suggestion;
+      if (index > -1 && !hidden && suggestion) {
         event.preventDefault();
-        const suggestion = filteredSuggestions[index]?.suggestion;
-        if (suggestion) {
-          select(suggestion);
-        }
+        select(suggestion);
       } else {
         dispatch("enter", input);
       }
@@ -98,7 +100,7 @@
     use:keyboardShortcut={key}
     on:blur={() => {
       hidden = true;
-      dispatch("blur");
+      dispatch("blur", input);
     }}
     on:focus={() => {
       hidden = false;

frontend/src/sidebar/FilterForm.svelte

@@ -41,6 +41,14 @@
     time_filter_value = v;
   });
 
+  /**
+   * Submit the filter form.
+   *
+   * This is called on all the three possible events (blur, select, enter)
+   * and also on the form submit. Having the listener on:enter would
+   * theoretically be unnecessary (as the form would also be submitted) but
+   * it seems to work around a Safari bug, see #809 and #1528.
+   */
   function submit() {
     account_filter.set(account_filter_value);
     fql_filter.set(fql_filter_value);
@@ -58,6 +66,7 @@
     setSize={true}
     on:blur={submit}
     on:select={submit}
+    on:enter={submit}
   />
   <AutocompleteInput
     bind:value={account_filter_value}
@@ -68,6 +77,7 @@
     setSize={true}
     on:blur={submit}
     on:select={submit}
+    on:enter={submit}
   />
   <AutocompleteInput
     bind:value={fql_filter_value}
@@ -80,6 +90,7 @@
     {valueSelector}
     on:blur={submit}
     on:select={submit}
+    on:enter={submit}
   />
   <button type="submit" />
 </form>