[IMP] mass_mailing: remove outdated and expensive from_inline conversion

When saving a mailing, we do some processing (converting classes to
inline styles mostly) in order for the mailing to display properly in
all email clients. Until we started saving the processed version
separately from the unprocessed version, we had to revert the process
whenever we would start editing the mailing. This was extremely
expensive and made the loading of a previously created email very, very
slow. This was kept so far for backward compatibility reasons 3 years
ago (see f296992). This commit removes the that unnecessary conversion.

Part-of: odoo/odoo#75901

addons/mass_mailing/static/src/js/mass_mailing_widget.js

@@ -140,8 +140,7 @@ var MassMailingFieldHtml = FieldHtml.extend({
      * @override
      */
     _renderEdit: function () {
-        this._isFromInline = !!this.value;
-        this._wysiwygSnippetsActive = !(this._isFromInline && $(this.value).is('.o_layout.o_basic_theme'));
+        this._wysiwygSnippetsActive = !$(this.value).is('.o_layout.o_basic_theme');
         if (!this.value) {
             this.value = this.recordData[this.nodeOptions['inline-field']];
         }
@@ -337,9 +336,6 @@ var MassMailingFieldHtml = FieldHtml.extend({
      * @override
      */
     _onLoadWysiwyg: function () {
-        if (this._isFromInline) {
-            this._fromInline();
-        }
         if (this.snippetsLoaded) {
             this._onSnippetsLoaded(this.snippetsLoaded);
         }

addons/web_editor/static/src/js/backend/convert_inline.js

@@ -210,23 +210,6 @@ function fontToImg($editable) {
     });
 }
 
-/**
- * Converts images which were the result of a font icon convertion to a font
- * icon again.
- *
- * @param {jQuery} $editable - the element in which the images will be converted
- *                           back to font icons
- */
-function imgToFont($editable) {
-    $editable.find('img[src*="/web_editor/font_to_img/"]').each(function () {
-        var $img = $(this);
-        $img.replaceWith($('<span/>', {
-            class: $img.data('class'),
-            style: $img.data('style')
-        }));
-    });
-}
-
 /*
  * Utility function to apply function over descendants elements
  *
@@ -309,44 +292,6 @@ function classToStyle($editable) {
     });
 }
 
-/**
- * Removes the inline style which is not necessary (because, for example, a
- * class on an element will induce the same style).
- *
- * @param {jQuery} $editable
- */
-function styleToClass($editable) {
-    // Outlook revert
-    $editable.find('.o_outlook_hack').each(function () {
-        $(this).after($('a,img', this));
-    }).remove();
-
-    var $c = $('<span/>').appendTo($editable[0].ownerDocument.body);
-
-    applyOverDescendants($editable[0], function (node) {
-        var $target = $(node);
-        var css = getMatchedCSSRules(node);
-        var style = '';
-        _.each(css, function (v,k) {
-            if (!(new RegExp('(^|;)\s*' + k).test(style))) {
-                style = k+':'+v+';'+style;
-            }
-        });
-        css = ($c.attr('style', style).attr('style') || '').split(/\s*;\s*/);
-        style = ($target.attr('style') || '').replace(/\s*:\s*/, ':').replace(/\s*;\s*/, ';');
-        _.each(css, function (v) {
-            style = style.replace(v, '');
-        });
-        style = style.replace(/;+(\s;)*/g, ';').replace(/^;/g, '');
-        if (style !== '') {
-            $target.attr('style', style);
-        } else {
-            $target.removeAttr('style');
-        }
-    });
-    $c.remove();
-}
-
 /**
  * Converts css display for attachment link to real image.
  * Without this post process, the display depends on the css and the picture
@@ -365,16 +310,6 @@ function attachmentThumbnailToLinkImg($editable) {
     });
 }
 
-/**
- * Revert attachmentThumbnailToLinkImg changes
- *
- * @see attachmentThumbnailToLinkImg
- * @param {jQuery} $editable
- */
-function linkImgToAttachmentThumbnail($editable) {
-    $editable.find('a[href*="/web/content/"][data-mimetype] > img').remove();
-}
-
 
 //--------------------------------------------------------------------------
 //--------------------------------------------------------------------------
@@ -429,49 +364,11 @@ FieldHtml.include({
             notifyChange: false,
         });
     },
-    /**
-     * Revert _toInline changes.
-     *
-     * @private
-     */
-    _fromInline: function () {
-        var $editable = this.wysiwyg.getEditable();
-        var html = this.wysiwyg.getValue();
-        $editable.html(html);
-
-        styleToClass($editable);
-        imgToFont($editable);
-        linkImgToAttachmentThumbnail($editable);
-
-        // fix outlook image rendering bug
-        $editable.find('img[style*="width"], img[style*="height"]').removeAttr('height width');
-
-        this.wysiwyg.setValue($editable.html(), {
-            notifyChange: false,
-        });
-    },
-
-    //--------------------------------------------------------------------------
-    // Handler
-    //--------------------------------------------------------------------------
-
-    /**
-     * @override
-     */
-    _onLoadWysiwyg: function () {
-        if (this.nodeOptions['style-inline'] && this.mode === "edit") {
-            this._fromInline();
-        }
-        this._super();
-    },
 });
 
 return {
     fontToImg: fontToImg,
-    imgToFont: imgToFont,
     classToStyle: classToStyle,
-    styleToClass: styleToClass,
     attachmentThumbnailToLinkImg: attachmentThumbnailToLinkImg,
-    linkImgToAttachmentThumbnail: linkImgToAttachmentThumbnail,
 };
 });