fix(ui): scroll long error messages in rename dialogs

apps/desktop/src/components/objects/ObjectBrowser.vue

@@ -3856,8 +3856,8 @@ function getObjectBrowserMenuItems(item: ObjectBrowserRow): ContextMenuItem[] {
       </DialogHeader>
       <div class="grid gap-3">
         <Input v-model="renameInput" :placeholder="t('contextMenu.renameObjectNamePlaceholder')" @keydown.enter.prevent="confirmRename" />
-        <pre v-if="renamePreviewSqlText" class="max-h-32 overflow-auto rounded bg-muted p-3 text-xs whitespace-pre-wrap" v-html="highlight(renamePreviewSqlText)"></pre>
+        <pre v-if="renamePreviewSqlText" class="max-h-32 min-w-0 max-w-full overflow-auto rounded bg-muted p-3 text-xs whitespace-pre-wrap" v-html="highlight(renamePreviewSqlText)"></pre>
-        <p v-if="renameError" class="text-sm text-destructive">{{ renameError }}</p>
+        <p v-if="renameError" class="min-w-0 max-w-full overflow-x-auto text-sm text-destructive">{{ renameError }}</p>
       </div>
       <DialogFooter>
         <Button variant="outline" @click="showRenameDialog = false">{{ t("dangerDialog.cancel") }}</Button>

apps/desktop/src/components/sidebar/SidebarTreeItemDialogs.vue

@@ -279,8 +279,8 @@ watch(
       </DialogHeader>
       <div class="grid gap-3">
         <Input v-model="renameObjectName" :placeholder="t('contextMenu.renameObjectNamePlaceholder')" @keydown.enter.prevent="confirmRenameObject" />
-        <pre v-if="renameObjectPreviewSql" class="max-h-32 overflow-auto rounded bg-muted p-3 text-xs whitespace-pre-wrap" v-html="highlight(renameObjectPreviewSql)"></pre>
+        <pre v-if="renameObjectPreviewSql" class="max-h-32 min-w-0 max-w-full overflow-auto rounded bg-muted p-3 text-xs whitespace-pre-wrap" v-html="highlight(renameObjectPreviewSql)"></pre>
-        <p v-if="renameObjectError" class="text-sm text-destructive">{{ renameObjectError }}</p>
+        <p v-if="renameObjectError" class="min-w-0 max-w-full overflow-x-auto text-sm text-destructive">{{ renameObjectError }}</p>
       </div>
       <DialogFooter>
         <Button variant="outline" @click="showRenameObjectDialog = false">{{ t("dangerDialog.cancel") }}</Button>
@@ -298,8 +298,8 @@ watch(
       </DialogHeader>
       <div class="grid gap-3">
         <Input v-model="renameMongoCollectionName" :placeholder="t('contextMenu.renameObjectNamePlaceholder')" :disabled="renameMongoCollectionLoading" @keydown.enter.prevent="confirmRenameMongoCollection" />
-        <pre v-if="renameMongoCollectionPreview" class="max-h-32 overflow-auto rounded bg-muted p-3 text-xs whitespace-pre-wrap">{{ renameMongoCollectionPreview }}</pre>
+        <pre v-if="renameMongoCollectionPreview" class="max-h-32 min-w-0 max-w-full overflow-auto rounded bg-muted p-3 text-xs whitespace-pre-wrap">{{ renameMongoCollectionPreview }}</pre>
-        <p v-if="renameMongoCollectionError" class="text-sm text-destructive">{{ renameMongoCollectionError }}</p>
+        <p v-if="renameMongoCollectionError" class="min-w-0 max-w-full overflow-x-auto text-sm text-destructive">{{ renameMongoCollectionError }}</p>
       </div>
       <DialogFooter>
         <Button variant="outline" :disabled="renameMongoCollectionLoading" @click="showRenameMongoCollectionDialog = false">{{ t("dangerDialog.cancel") }}</Button>

apps/desktop/src/components/ui/ErrorBanner.vue

@@ -77,10 +77,20 @@ async function copy() {
 
   <!-- centered: 居中占满 -->
   <div v-else class="flex-1 min-h-0 flex flex-col items-center justify-center gap-2 px-6 py-4 text-center">
-    <TriangleAlert class="h-8 w-8 text-destructive/50" aria-hidden="true" />
+    <TriangleAlert class="h-8 w-8 shrink-0 text-destructive/50" aria-hidden="true" />
-    <div data-native-clipboard class="min-h-0 max-h-48 max-w-lg overflow-auto space-y-1 select-text text-destructive" @mousedown.stop @click.stop>
+    <!--
+      The message box must NOT carry a fixed max-height cap: every ancestor up
+      the results pane is overflow-hidden (DataGrid root/cell, splitpanes pane),
+      so this box is the only scroll surface and the flex chain
+      (flex-1 min-h-0) is what bounds it to the pane height. A fixed rem cap
+      clips long error text with an unreachable scrollbar instead — see issue
+      #7960. min-h-0 is the vertical shrink enabler; min-w-0 lets long
+      unspaced backend tokens wrap instead of widening this centered child.
+      Do not remove either.
+    -->
+    <div data-native-clipboard class="min-h-0 min-w-0 max-w-lg overflow-y-auto space-y-1 select-text text-destructive" @mousedown.stop @click.stop>
       <div class="text-sm font-medium">{{ displayTitle }}</div>
-      <div class="text-xs break-all cursor-text text-destructive/80 select-text">{{ message }}</div>
+      <div class="text-xs whitespace-pre-wrap break-words text-left cursor-text text-destructive/80 select-text">{{ message }}</div>
     </div>
     <div class="shrink-0 flex flex-wrap items-center justify-center gap-2 text-foreground">
       <Button variant="outline" size="sm" class="h-7 gap-1.5 px-2 text-xs" @click.stop="copy">

apps/desktop/src/components/ui/__tests__/ErrorBannerClipboard.spec.ts

@@ -14,6 +14,14 @@ function findNativeClipboardRegion(container: HTMLElement, text: string): HTMLEl
   return region;
 }
 
+// The centered variant's clipboard region wraps title + message in one node,
+// so match by containment instead of exact text.
+function findClipboardRegionContaining(container: HTMLElement, text: string): HTMLElement {
+  const region = Array.from(container.querySelectorAll<HTMLElement>("[data-native-clipboard]")).find((element) => element.textContent?.includes(text));
+  if (!region) throw new Error(`Native clipboard region not found containing: ${text}`);
+  return region;
+}
+
 function selectRegion(region: HTMLElement) {
   const selection = window.getSelection();
   const range = document.createRange();
@@ -22,15 +30,15 @@ function selectRegion(region: HTMLElement) {
   selection?.addRange(range);
 }
 
-async function mountCardBanner() {
+async function mountBanner(variant: "card" | "centered", message: string) {
   const container = document.createElement("div");
   mountedContainers.push(container);
   document.body.append(container);
 
   const app = createApp(ErrorBanner, {
-    variant: "card",
+    variant,
     title: "Save failed",
-    message: "Conditional request failed",
+    message,
   });
   app.use(
     createI18n({
@@ -53,7 +61,7 @@ afterEach(() => {
 
 describe("ErrorBanner native clipboard selection", () => {
   it.each(["Save failed", "Conditional request failed"])("preserves native copy for selected %s text", async (text) => {
-    const container = await mountCardBanner();
+    const container = await mountBanner("card", "Conditional request failed");
     selectRegion(findNativeClipboardRegion(container, text));
 
     expect(
@@ -65,8 +73,21 @@ describe("ErrorBanner native clipboard selection", () => {
     ).toBe(true);
   });
 
+  it("preserves native copy for selected centered error message", async () => {
+    const container = await mountBanner("centered", "fatal error\n\nlong detail line");
+    selectRegion(findClipboardRegionContaining(container, "long detail line"));
+
+    expect(
+      eventTargetAllowsNativeClipboard({
+        key: "c",
+        metaKey: true,
+        target: container,
+      }),
+    ).toBe(true);
+  });
+
   it("leaves grid copy shortcuts active without a text selection", async () => {
-    const container = await mountCardBanner();
+    const container = await mountBanner("card", "Conditional request failed");
 
     expect(
       eventTargetAllowsNativeClipboard({

apps/desktop/src/components/ui/__tests__/ErrorBannerLayoutGuard.spec.ts

@@ -0,0 +1,41 @@
+// Source-contract guard for the ErrorBanner "centered" variant (the query
+// execution error panel rendered by DataGrid).
+
+// Overview: the centered banner is the only scroll surface for execution
+// errors — every ancestor up the results pane is overflow-hidden (DataGrid
+// root and content cell, splitpanes pane), so the pane height must reach the
+// message box through the flex chain (banner root `flex-1 min-h-0`). A fixed
+// `max-h-*` cap on the message box breaks that chain: long error text gets
+// clipped at the cap, and in a short pane the tiny internal scrollbar is
+// clipped out of view entirely — see #7960 (错误信息面板无法展示完整错误信息).
+//
+// These guarantees are what stop that from re-happening:
+//   1. The message box keeps `min-h-0` (the flex-shrink enabler) and
+//      `overflow-y-auto` (the internal scroller) with NO fixed max-height.
+//   2. The message text keeps `whitespace-pre-wrap break-words`: backend
+//      errors are multi-line ("summary\n\ndetail"); `break-all` collapsed
+//      those newlines into a dense wall of text, and without wrap guards a
+//      long token could force horizontal overflow.
+// If either is removed, the clipping regresses. Keep these assertions updated
+// alongside the component whenever the class strings are touched.
+
+import { readFileSync } from "node:fs";
+import { describe, expect, it } from "vitest";
+
+const errorBannerSource = readFileSync(new URL("../ErrorBanner.vue", import.meta.url), "utf8");
+
+describe("ErrorBanner centered layout guard", () => {
+  it("bounds the centered message box by the flex chain, not a fixed max-height", () => {
+    // The box must stay shrinkable in both axes (`min-h-0 min-w-0`) and scroll internally
+    // (`overflow-y-auto`); a fixed `max-h-48` cap re-introduces #7960.
+    expect(errorBannerSource).toContain('class="min-h-0 min-w-0 max-w-lg overflow-y-auto space-y-1 select-text text-destructive"');
+    expect(errorBannerSource).not.toContain("max-h-48");
+  });
+
+  it("preserves backend error newlines and wraps long tokens", () => {
+    // `text-left` keeps multi-line errors scannable under the centered
+    // variant's inherited `text-center` (single-line messages are unaffected:
+    // the box hugs its content).
+    expect(errorBannerSource).toContain("text-xs whitespace-pre-wrap break-words text-left cursor-text");
+  });
+});

packages/app-tests/sidebarDialogRouting.test.ts

@@ -6,6 +6,7 @@ const connectionTree = readFileSync("apps/desktop/src/components/sidebar/Connect
 const treeItem = readFileSync("apps/desktop/src/components/sidebar/TreeItem.vue", "utf8");
 const runtimeHost = readFileSync("apps/desktop/src/components/sidebar/SidebarTreeRuntimeHost.vue", "utf8");
 const dialogHost = readFileSync("apps/desktop/src/components/sidebar/SidebarTreeItemDialogs.vue", "utf8");
+const objectBrowser = readFileSync("apps/desktop/src/components/objects/ObjectBrowser.vue", "utf8");
 const dialogState = readFileSync("apps/desktop/src/components/sidebar/sidebarTreeDialogState.ts", "utf8");
 const visibleDatabasesDialog = readFileSync("apps/desktop/src/components/sidebar/VisibleDatabasesDialog.vue", "utf8");
 const visibleSchemasDialog = readFileSync("apps/desktop/src/components/sidebar/VisibleSchemasDialog.vue", "utf8");
@@ -41,6 +42,16 @@ test("remaining form dialogs render once at tree level and keep confirm/cancel b
   assert.match(dialogHost, /@click="confirmPasteTable"/);
 });
 
+test("rename dialogs preserve their layout while scrolling unbounded identifiers", () => {
+  const previewClass = "max-h-32 min-w-0 max-w-full overflow-auto rounded bg-muted p-3 text-xs whitespace-pre-wrap";
+  const errorClass = "min-w-0 max-w-full overflow-x-auto text-sm text-destructive";
+
+  assert.equal(occurrences(dialogHost, previewClass), 2);
+  assert.equal(occurrences(dialogHost, errorClass), 2);
+  assert.ok(objectBrowser.includes(previewClass));
+  assert.ok(objectBrowser.includes(errorClass));
+});
+
 test("dialog controller routing preserves shared open-flag refs instead of spreading them", () => {
   assert.match(runtimeHost, /createRoutedSidebarDialogController\(/);
   assert.doesNotMatch(runtimeHost, /reactive<Record<string, any>>\(\{ \.\.\.controller/);