update getImageSrc

Author: Goaman

addons/html_editor/static/src/main/media/image_post_process_plugin.js

@@ -17,9 +17,6 @@ export class ImagePostProcessPlugin extends Plugin {
     static id = "imagePostProcess";
     static dependencies = ["style"];
     static shared = ["processImage"];
-    resources = {
-        system_attributes: ["data-bg-src"],
-    };
 
     /**
      * Applies data-attributes modifications to an img tag and returns a dataURL

addons/html_editor/static/src/utils/image.js

@@ -97,16 +97,7 @@ export function getImageSrc(el) {
     if (el.tagName === "IMG") {
         return el.getAttribute("src");
     }
-    if (el.dataset.bgSrc && el.style.backgroundImage.includes(el.dataset.bgSrc)) {
-        return el.dataset.bgSrc;
-    }
-    const url = backgroundImageCssToParts(getComputedStyle(el)["background-image"]).url;
-    // Cache the this value as getComputedStyle can eat performance
-    if (url) {
-        el.dataset.bgSrc = url;
-    } else {
-        delete el.dataset.bgSrc;
-    }
+    const url = backgroundImageCssToParts(el.style.backgroundImage).url;
     return url && getBgImageURLFromURL(url);
 }