refine collapse styling

Author: Jicheng Lu

src/lib/styles/pages/_chat.scss

@@ -2996,17 +2996,36 @@
     flex-wrap: wrap;
     gap: 6px;
     margin-top: 4px;
+    min-width: 0;
 }
 
 
 .mss-state-value {
     flex: 1 1 calc(50% - 6px);
-    min-width: calc(50% - 6px);
+    min-width: 0;
+    max-width: 100%;
     font-size: 14px;
     padding: 4px 8px;
     border-radius: 6px;
     background-color: color-mix(in srgb, white 3%, transparent);
     border: 1px solid color-mix(in srgb, white 5%, transparent);
+    cursor: pointer;
+}
+
+
+.mss-value {
+    overflow-wrap: anywhere;
+    word-break: break-word;
+    white-space: pre-wrap;
+}
+
+
+.mss-state-value-collapsed .mss-value {
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    word-break: normal;
+    overflow-wrap: normal;
 }
 
 

src/lib/styles/pages/_conversation.scss

@@ -266,27 +266,52 @@
  * ========================================================================
  * Replaces the legacy `.text-collapse` rule from
  * src/lib/scss/custom/pages/_conversation.scss. The dialog text is
- * collapsed to the first 5 lines by default; clicking the More button
+ * collapsed to the first 10 lines by default; clicking the More button
  * removes this class so the content can flow to its natural height.
  *
  * Two clamping mechanisms are layered here for reliability:
- * 1. `-webkit-line-clamp: 5` with `display: -webkit-box` gives the
+ * 1. `-webkit-line-clamp: 10` with `display: -webkit-box` gives the
  *    nicer "line truncation with ellipsis" effect on simple text.
  * 2. `max-height: 10lh` is the hard fallback. The inner `<Markdown>`
  *    wraps its rendered HTML in a `.markdown-container` with
  *    `overflow-x: auto`, which establishes its own block formatting
  *    context — that BFC defeats line-clamp on the parent because text
  *    flow is sealed inside the child. The max-height cap clips
  *    reliably regardless of inner BFCs and is what actually keeps long
- *    code blocks / tables collapsed.
+ *    code blocks / tables collapsed. A `::after` pseudo-element below
+ *    paints a '...' in the bottom-right corner so the truncation is
+ *    still signaled visually when line-clamp's native ellipsis is
+ *    suppressed by the inner BFC.
  */
 .text-collapse {
+    position: relative;
     overflow: hidden;
     max-height: 10lh;
     display: -webkit-box;
     -webkit-box-orient: vertical;
-    -webkit-line-clamp: 5;
-    line-clamp: 5;
+    -webkit-line-clamp: 10;
+    line-clamp: 10;
+}
+
+/* Ellipsis fallback for collapsed content whose inner BFC defeats
+ * -webkit-line-clamp (notably the Markdown container's overflow-x: auto
+ * around code blocks / tables). The native line-clamp ellipsis already
+ * handles plain text; this pseudo-element guarantees a '...' indicator
+ * is rendered even when line-clamp is sealed inside the child BFC.
+ *
+ * The gradient fades from transparent to the conversation page
+ * background (white) so the '...' sits cleanly over the last visible
+ * line without obscuring readable text. */
+.text-collapse::after {
+    content: '...';
+    position: absolute;
+    right: 0;
+    bottom: 0;
+    padding: 0 0.25rem 0 1.5rem;
+    background: linear-gradient(to right, rgba(255, 255, 255, 0), rgb(255 255 255) 50%);
+    color: inherit;
+    font-weight: inherit;
+    pointer-events: none;
 }
 
 

src/routes/VerticalLayout/Sidebar.svelte

@@ -292,7 +292,7 @@
 					{:else if item.subMenu}
 						<li>
 							<!-- svelte-ignore a11y_invalid_attribute -->
-							<a href="javascript:void(0);" class="has-arrow clickable">
+							<a href="javascript:void(0);" class="has-arrow cursor-pointer">
 								<i class={item.icon}></i>
 								<span>{$_(item.label)}</span>
 							</a>
@@ -301,14 +301,14 @@
 									{#if subMenu.isChildItem}
 										<li>
 											<!-- svelte-ignore a11y_invalid_attribute -->
-											<a href="javascript:void(0);" class="has-arrow clickable">
+											<a href="javascript:void(0);" class="has-arrow cursor-pointer">
 												<span>{$_(subMenu.label)}</span>
 											</a>
 											<ul class="sub-menu mm-collapse">
 												{#each subMenu.childItems as childItem}
 													<li>
 														<!-- svelte-ignore a11y_invalid_attribute -->
-														<a href="javascript:void(0);" class="clickable" id={getCleanUrl(childItem.link)} onclick={() => goToPage(childItem.link)}>
+														<a href="javascript:void(0);" class="cursor-pointer" id={getCleanUrl(childItem.link)} onclick={() => goToPage(childItem.link)}>
 															{$_(childItem.label)}
 														</a>
 													</li>
@@ -318,7 +318,7 @@
 									{:else}
 										<li>
 											<!-- svelte-ignore a11y_invalid_attribute -->
-											<a href="javascript:void(0);" class="clickable" id={getCleanUrl(subMenu.link)} onclick={() => goToPage(subMenu.link)}>
+											<a href="javascript:void(0);" class="cursor-pointer" id={getCleanUrl(subMenu.link)} onclick={() => goToPage(subMenu.link)}>
 												{$_(subMenu.label)}
 											</a>
 										</li>
@@ -329,7 +329,7 @@
 					{:else}
 						<li>
 							<!-- svelte-ignore a11y_invalid_attribute -->
-							<a href="javascript:void(0);" class="clickable" id={getCleanUrl(item.link)} onclick={() => goToPage(item.link)}>
+							<a href="javascript:void(0);" class="cursor-pointer" id={getCleanUrl(item.link)} onclick={() => goToPage(item.link)}>
 								<i class={item.icon}></i>
 								<span>{$_(item.label)}</span>
 							</a>

src/routes/chat/[agentId]/[conversationId]/instant-log/message-state-log-element.svelte

@@ -4,6 +4,16 @@
 
     const defaultValue = '-';
 
+    let collapsed = $state(true);
+
+    /** @param {KeyboardEvent} e @param {() => void} fn */
+    function handleKey(e, fn) {
+        if (e.key === 'Enter' || e.key === ' ') {
+            e.preventDefault();
+            fn();
+        }
+    }
+
     /** @param {any} value */
     function buildDataValue(value) {
         return value || defaultValue;
@@ -46,21 +56,37 @@
         </div>
     </div>
     <div class="mss-content">
-        <div class="mss-state-value">
+        <div
+            class="mss-state-value"
+            class:mss-state-value-collapsed={collapsed}
+            role="button"
+            tabindex="0"
+            title={collapsed ? 'Click to expand' : 'Click to collapse'}
+            onclick={() => (collapsed = !collapsed)}
+            onkeydown={(e) => handleKey(e, () => (collapsed = !collapsed))}
+        >
             <div class="mss-value">
                 {beforeDataValue}
             </div>
-            {#if !!beforeActiveRoundText}
+            {#if !!beforeActiveRoundText && !collapsed}
             <div class="mss-active-rounds">
                 {`${beforeActiveRoundText}`}
             </div>
             {/if}
         </div>
-        <div class="mss-state-value mss-state-value-warn">
+        <div
+            class="mss-state-value mss-state-value-warn"
+            class:mss-state-value-collapsed={collapsed}
+            role="button"
+            tabindex="0"
+            title={collapsed ? 'Click to expand' : 'Click to collapse'}
+            onclick={() => (collapsed = !collapsed)}
+            onkeydown={(e) => handleKey(e, () => (collapsed = !collapsed))}
+        >
             <div class="mss-value">
                 {afterDataValue}
             </div>
-            {#if !!afterActiveRoundText}
+            {#if !!afterActiveRoundText && !collapsed}
             <div class="mss-active-rounds">
                 {`${afterActiveRoundText}`}
             </div>

src/routes/chat/[agentId]/[conversationId]/persist-log/content-log-element.svelte

@@ -8,8 +8,13 @@
     let { data } = $props();
 
     let is_collapsed = $state(true);
+    let contentEl = $state();
+    let isOverflowing = $state(false);
+    
+    const COLLAPSE_LINE_THRESHOLD = 10;
     const unknownAgent = "Uknown";
     const collapsedSources = [
+        ContentLogSource.UserInput,
         ContentLogSource.Prompt,
         ContentLogSource.AgentResponse,
         ContentLogSource.FunctionCall,
@@ -48,12 +53,26 @@
         e.preventDefault();
         is_collapsed = !is_collapsed;
     }
+
+    $effect(() => {
+        void data?.content;
+        if (!contentEl || !collapsedSources.includes(data.source)) {
+            isOverflowing = false;
+            return;
+        }
+        requestAnimationFrame(() => {
+            if (!contentEl) return;
+            const cs = getComputedStyle(contentEl);
+            let lineHeight = parseFloat(cs.lineHeight);
+            if (!Number.isFinite(lineHeight) || lineHeight <= 0) {
+                lineHeight = parseFloat(cs.fontSize) * 1.5 || 21;
+            }
+            isOverflowing = contentEl.scrollHeight > lineHeight * COLLAPSE_LINE_THRESHOLD + 1;
+        });
+    });
 </script>
 
-<!--
-  NOTE: id={`content-log-${data.message_id}`} is queried by chat-box.svelte's
-  autoScrollToTargetLog(); keep this id attribute as-is.
--->
+
 <div class="cle-element" id={`content-log-${data.message_id}`}>
     <div class="cle-meta">
         <div>
@@ -77,11 +96,14 @@
         </div>
     </div>
     <div class={`cle-content ${logDisplayStyle}`}>
-        <div class:cle-collapse={collapsedSources.includes(data.source) && !!is_collapsed}>
+        <div
+            bind:this={contentEl}
+            class:cle-collapse={collapsedSources.includes(data.source) && isOverflowing && !!is_collapsed}
+        >
             <Markdown containerClasses={logTextStyle} text={data?.content} rawText={rawTextSources.includes(data.source)} />
         </div>
 
-        {#if collapsedSources.includes(data.source)}
+        {#if collapsedSources.includes(data.source) && isOverflowing}
             <button class="cle-toggle-btn" onclick={(e) => toggleText(e)}>
                 {`${is_collapsed ? 'More +' : 'Less -'}`}
             </button>

src/routes/page/conversation/[conversationId]/conv-dialog-element.svelte

@@ -3,21 +3,41 @@
 	import RcJsInterpreter from '../../../chat/[agentId]/[conversationId]/rich-content/rc-js-interpreter.svelte';
 	import { RichType } from '$lib/helpers/enums';
 
+  const COLLAPSE_LINE_THRESHOLD = 10;
+
   /** @type {{ dialog: import('$conversationTypes').ChatResponseModel }} */
   let { dialog } = $props();
 
   let is_collapsed = $state(true);
+  let contentEl = $state();
+  let isOverflowing = $state(false);
 
   /** @param {any} e */
   function toggleText(e) {
     e.preventDefault();
     is_collapsed = !is_collapsed;
   }
+
+  $effect(() => {
+    void dialog?.rich_content?.message?.text;
+    void dialog?.text;
+    if (!contentEl) return;
+    requestAnimationFrame(() => {
+      if (!contentEl) return;
+      const cs = getComputedStyle(contentEl);
+      let lineHeight = parseFloat(cs.lineHeight);
+      if (!Number.isFinite(lineHeight) || lineHeight <= 0) {
+        lineHeight = parseFloat(cs.fontSize) * 1.5 || 21;
+      }
+      isOverflowing = contentEl.scrollHeight > lineHeight * COLLAPSE_LINE_THRESHOLD + 1;
+    });
+  });
 </script>
 
 <div
+  bind:this={contentEl}
   class="text-sm font-medium leading-relaxed"
-  class:text-collapse={is_collapsed}
+  class:text-collapse={is_collapsed && isOverflowing}
 >
   {#if dialog?.rich_content?.message?.rich_type === RichType.ProgramCode
       && dialog?.rich_content?.message?.language === 'javascript'}
@@ -31,6 +51,7 @@
   {/if}
 </div>
 
+{#if isOverflowing}
 <button
   type="button"
   class="mt-1 inline-flex items-center gap-1 text-xs font-medium text-primary transition-colors hover:text-primary-hover hover:underline cursor-pointer"
@@ -39,4 +60,5 @@
   <i class="mdi {is_collapsed ? 'mdi-chevron-down' : 'mdi-chevron-up'} text-sm leading-none"></i>
   <span>{is_collapsed ? 'More' : 'Less'}</span>
 </button>
+{/if}