Make menu lists searchable (#1499)

* Searchable font list

* Bug fixes and UX polish for edge cases

* More work, still more bugs to fix

* Don't update highlight when not open

* Bug fixes

* Additional bug fixes and code review

* Fix keyboard input being sent to backend

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

frontend/src/components/widgets/inputs/DropdownInput.svelte

@@ -8,7 +8,7 @@
 	import IconLabel from "@graphite/components/widgets/labels/IconLabel.svelte";
 	import TextLabel from "@graphite/components/widgets/labels/TextLabel.svelte";
 
-	const DASH_ENTRY = { label: "-" };
+	const DASH_ENTRY = { value: "", label: "-" };
 
 	const dispatch = createEventDispatcher<{ selectedIndex: number }>();
 
@@ -56,7 +56,7 @@
 
 	function unFocusDropdownBox(e: FocusEvent) {
 		const blurTarget = (e.target as HTMLDivElement | undefined)?.closest("[data-dropdown-input]") || undefined;
-		if (blurTarget !== self?.div()) open = false;
+		if (blurTarget !== self?.div?.()) open = false;
 	}
 </script>
 
@@ -68,7 +68,6 @@
 		{tooltip}
 		on:click={() => !disabled && (open = true)}
 		on:blur={unFocusDropdownBox}
-		on:keydown={(e) => menuList?.keydown(e, false)}
 		tabindex={disabled ? -1 : 0}
 		data-floating-menu-spawner
 	>