Update the TinyMCE initialization:

- Replace `wp_htmledit_pre()` and `wp_richedit_pre()` with `format_for_editor()`.
- Replace the `'htmledit_pre'` and `'richedit_pre'` filters with `'format_for_editor'`.
- Do not run the post content through `wpautop()` in PHP when the visual editor is default. Run the textarea content through the JS wpautop on initializing TinyMCE.
- Simplify both editors initialization.
- Improve setting of `wpActiveEditor` in Quicktags.
- Improve editor.js, use `tinymce.$` when possible.
See #32425.

git-svn-id: https://develop.svn.wordpress.org/trunk@32899 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/css/editor.css

@@ -286,7 +286,6 @@ div.mce-path {
 .mce-path-item,
 .mce-path .mce-divider {
 	font-size: 12px;
-	line-height: 18px;
 }
 
 .mce-toolbar .mce-btn,
@@ -1059,6 +1058,7 @@ i.mce-i-wp_code:before {
 	position: relative;
 	border-bottom: 1px solid #dedede;
 	background: #f5f5f5;
+	min-height: 30px;
 }
 
 .has-dfw .quicktags-toolbar {