Add 'scrollable' prop to Markdown component for better control over scrolling behavior (#964)

The scrollable prop controls if ScrollbarOverlay is added to the
Markdown component.

frontend/app/element/markdown.less

@@ -7,6 +7,7 @@
     overflow: hidden;
     height: 100%;
     width: 100%;
+
     .content {
         height: 100%;
         width: 100%;
@@ -17,6 +18,10 @@
         font-size: 14px;
         overflow-wrap: break-word;
 
+        &.non-scrollable {
+            overflow: hidden;
+        }
+
         .heading {
             &:first-of-type {
                 margin-top: 0 !important;

frontend/app/element/markdown.tsx

@@ -178,9 +178,19 @@ type MarkdownProps = {
     className?: string;
     onClickExecute?: (cmd: string) => void;
     resolveOpts?: MarkdownResolveOpts;
+    scrollable?: boolean;
 };
 
-const Markdown = ({ text, textAtom, showTocAtom, style, className, resolveOpts, onClickExecute }: MarkdownProps) => {
+const Markdown = ({
+    text,
+    textAtom,
+    showTocAtom,
+    style,
+    className,
+    resolveOpts,
+    scrollable = true,
+    onClickExecute,
+}: MarkdownProps) => {
     const textAtomValue = useAtomValueSafe(textAtom);
     const tocRef = useRef<TocItem[]>([]);
     const showToc = useAtomValueSafe(showTocAtom) ?? false;
@@ -240,8 +250,8 @@ const Markdown = ({ text, textAtom, showTocAtom, style, className, resolveOpts,
 
     text = textAtomValue ?? text;
 
-    return (
-        <div className={clsx("markdown", className)} style={style}>
+    const ScrollableMarkdown = () => {
+        return (
             <OverlayScrollbarsComponent
                 ref={contentsOsRef}
                 className="content"
@@ -274,6 +284,45 @@ const Markdown = ({ text, textAtom, showTocAtom, style, className, resolveOpts,
                     {text}
                 </ReactMarkdown>
             </OverlayScrollbarsComponent>
+        );
+    };
+
+    const NonScrollableMarkdown = () => {
+        return (
+            <div className="content non-scrollable">
+                <ReactMarkdown
+                    remarkPlugins={[remarkGfm, [RemarkFlexibleToc, { tocRef: tocRef.current }]]}
+                    rehypePlugins={[
+                        rehypeRaw,
+                        rehypeHighlight,
+                        () =>
+                            rehypeSanitize({
+                                ...defaultSchema,
+                                attributes: {
+                                    ...defaultSchema.attributes,
+                                    span: [
+                                        ...(defaultSchema.attributes?.span || []),
+                                        // Allow all class names starting with `hljs-`.
+                                        ["className", /^hljs-./],
+                                        // Alternatively, to allow only certain class names:
+                                        // ['className', 'hljs-number', 'hljs-title', 'hljs-variable']
+                                    ],
+                                },
+                                tagNames: [...(defaultSchema.tagNames || []), "span"],
+                            }),
+                        () => rehypeSlug({ prefix: idPrefix }),
+                    ]}
+                    components={markdownComponents}
+                >
+                    {text}
+                </ReactMarkdown>
+            </div>
+        );
+    };
+
+    return (
+        <div className={clsx("markdown", className)} style={style}>
+            {scrollable ? <ScrollableMarkdown /> : <NonScrollableMarkdown />}
             {toc && (
                 <OverlayScrollbarsComponent className="toc" options={{ scrollbars: { autoHide: "leave" } }}>
                     <div className="toc-inner">

frontend/app/view/waveai/waveai.tsx

@@ -14,7 +14,6 @@ import { atom, Atom, PrimitiveAtom, useAtomValue, useSetAtom, WritableAtom } fro
 import type { OverlayScrollbars } from "overlayscrollbars";
 import { OverlayScrollbarsComponent, OverlayScrollbarsComponentRef } from "overlayscrollbars-react";
 import { forwardRef, memo, useCallback, useEffect, useImperativeHandle, useMemo, useRef, useState } from "react";
-import tinycolor from "tinycolor2";
 import "./waveai.less";
 
 interface ChatMessageType {
@@ -263,11 +262,8 @@ function makeWaveAiViewModel(blockId): WaveAiModel {
 
 const ChatItem = ({ chatItem }: ChatItemProps) => {
     const { isAssistant, text, isError } = chatItem;
-    const senderClassName = isAssistant ? "chat-msg-assistant" : "chat-msg-user";
-    const msgClassName = `chat-msg ${senderClassName}`;
     const cssVar = "--panel-bg-color";
     const panelBgColor = getComputedStyle(document.documentElement).getPropertyValue(cssVar).trim();
-    const color = tinycolor(panelBgColor);
 
     const renderError = (err: string): React.JSX.Element => <div className="chat-msg-error">{err}</div>;
 
@@ -284,7 +280,7 @@ const ChatItem = ({ chatItem }: ChatItemProps) => {
                         </div>
                     </div>
                     <div className="chat-msg chat-msg-assistant">
-                        <Markdown text={text} />
+                        <Markdown text={text} scrollable={false} />
                     </div>
                 </>
             ) : (
@@ -299,7 +295,7 @@ const ChatItem = ({ chatItem }: ChatItemProps) => {
         return (
             <>
                 <div className="chat-msg chat-msg-user">
-                    <Markdown className="msg-text" text={text} />
+                    <Markdown className="msg-text" text={text} scrollable={false} />
                 </div>
             </>
         );