Attempt to bypass image GC

output/main.js

@@ -44,6 +44,11 @@ const filteredCommunities = {
 	],
 };
 
+/**
+ * Hanging reference to preloaded images to avoid garbage collection.
+ */
+const preloadedImages = [];
+
 // This can be achieved with `text-overflow: ellipsis` instead
 // and generated entirely server-side.
 const transformJoinURL = (join_link) => {
@@ -134,8 +139,6 @@ function displayQRModal(communityID) {
 }
 
 function hideQRModal(communityID) {
-	dom.details_modal_room_icon().src = "";
-	dom.details_modal_qr_code().src = "";
 	dom.details_modal().close();
 }
 
@@ -228,13 +231,17 @@ function preloadImages() {
 		rowElement => rowElement.getAttribute(ATTRIBUTES.ROW.ROOM_ICON)
 	)
 	for (const identifier of identifiers) {
-		(new Image()).src = communityQRCodeURL(identifier);
+		const image = new Image();
+		image.src = communityQRCodeURL(identifier);
+		preloadedImages.push(image);
 	}
 	for (const icon of icons) {
 		if (!icon) {
 			continue;
 		}
-		(new Image()).src = icon;
+		const image = new Image();
+		image.src = icon;
+		preloadedImages.push(image);
 	}
 }