Clean legacy SimpleMDE code (#17926)

Since we are using EasyMDE now, we do not need to keep the SimpleMDE code anymore.

This PR removes all legacy SimpleMDE code, and makes some related changes:
* `createCommentEasyMDE` can accept native DOM element, and it doesn't need `jQuery.data` to store EasyMDE editor object (as discussed about the frontend guideline).
* introduce `getAttachedEasyMDE` to get the attached EasyMDE editor object, it's easier to find all the usage of EasyMDE.
* rename variable names from `$simplemde` to `easyMDE`, the `$` was incorrect because it is a EasyMDE editor, not a jQuery object.

With this PR, it will be easier to do more refactoring or replacing EasyMDE with other editors.

1 files changed, 4 insertions, 4 deletions

diff --git a/web_src/js/features/comp/ImagePaste.js b/web_src/js/features/comp/ImagePaste.js
index 99f4e069cc..8c8a4186c7 100644
--- a/web_src/js/features/comp/ImagePaste.js
+++ b/web_src/js/features/comp/ImagePaste.js
@@ -76,14 +76,14 @@ export function initCompImagePaste($target) {
   });
 }
 
-export function initSimpleMDEImagePaste(simplemde, dropzone, files) {
+export function initEasyMDEImagePaste(easyMDE, dropzone, files) {
   const uploadUrl = dropzone.getAttribute('data-upload-url');
-  simplemde.codemirror.on('paste', async (_, e) => {
+  easyMDE.codemirror.on('paste', async (_, e) => {
     for (const img of clipboardPastedImages(e)) {
       const name = img.name.substr(0, img.name.lastIndexOf('.'));
       const data = await uploadFile(img, uploadUrl);
-      const pos = simplemde.codemirror.getCursor();
-      simplemde.codemirror.replaceRange(`![${name}](/attachments/${data.uuid})`, pos);
+      const pos = easyMDE.codemirror.getCursor();
+      easyMDE.codemirror.replaceRange(`![${name}](/attachments/${data.uuid})`, pos);
       const input = $(`<input id="${data.uuid}" name="files" type="hidden">`).val(data.uuid);
       files.append(input);
     }