Revert "Speed up editor by lazily loading CodeMirror (#1766)"

This reverts commit 0db921dd39.

This caused a regression that needs looking into:
https://github.com/ankitects/anki/issues/1775

ts/editor/CodeMirror.svelte

@@ -30,7 +30,6 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
     export let configuration: CodeMirrorLib.EditorConfiguration;
     export let code: Writable<string>;
-    export let hidden = false;
 
     const defaultConfiguration = {
         rtlMoveVisually: true,
@@ -80,7 +79,6 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         use:openCodeMirror={{
             configuration: { ...configuration, ...defaultConfiguration },
             resolve,
-            hidden,
         }}
     />
 </div>

ts/editor/code-mirror.ts

@@ -63,37 +63,24 @@ export function focusAndSetCaret(
 interface OpenCodeMirrorOptions {
     configuration: CodeMirror.EditorConfiguration;
     resolve(editor: CodeMirror.EditorFromTextArea): void;
-    hidden: boolean;
 }
 
 export function openCodeMirror(
     textarea: HTMLTextAreaElement,
-    options: Partial<OpenCodeMirrorOptions>,
+    { configuration, resolve }: Partial<OpenCodeMirrorOptions>,
 ): { update: (options: Partial<OpenCodeMirrorOptions>) => void; destroy: () => void } {
-    let editor: CodeMirror.EditorFromTextArea;
+    const editor = CodeMirror.fromTextArea(textarea, configuration);
+    resolve?.(editor);
 
-    function update({
-        configuration,
-        resolve,
-        hidden,
-    }: Partial<OpenCodeMirrorOptions>): void {
-        if (editor) {
+    return {
+        update({ configuration }: Partial<OpenCodeMirrorOptions>): void {
             for (const key in configuration) {
                 editor.setOption(
                     key as keyof CodeMirror.EditorConfiguration,
                     configuration[key],
                 );
             }
-        } else if (!hidden) {
-            editor = CodeMirror.fromTextArea(textarea, configuration);
-            resolve?.(editor);
-        }
-    }
-
-    update(options);
-
-    return {
-        update,
+        },
         destroy(): void {
             editor.toTextArea();
         },

ts/editor/plain-text-input/PlainTextInput.svelte

@@ -136,13 +136,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     class:hidden
     on:focusin={() => ($focusedInput = api)}
 >
-    <CodeMirror
-        {configuration}
-        {code}
-        {hidden}
-        bind:api={codeMirror}
-        on:change={onChange}
-    />
+    <CodeMirror {configuration} {code} bind:api={codeMirror} on:change={onChange} />
 </div>
 
 <style lang="scss">