Add failing regression test for browser find focus

.github/workflows/ci.yml

@@ -238,9 +238,9 @@ jobs:
 
   tests-build-and-lag:
     # Build the full cmux scheme and run the lag regression on WarpBuild.
-    # XCUITests cannot run on WarpBuild (Virtualization.framework limitation:
-    # XCUIApplication stuck "Running Background", 62s activation timeout per
-    # test). Interactive UI tests run via test-e2e.yml on GitHub-hosted runners.
+    # Keep lag validation separate from UI regressions so functional UI failures
+    # and performance regressions stay isolated. Broader interactive UI suites
+    # still run via test-e2e.yml on GitHub-hosted runners.
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository
     runs-on: warp-macos-15-arm64-6x
     timeout-minutes: 20
@@ -350,6 +350,7 @@ jobs:
           VDISPLAY_PID=$!
           echo "VDISPLAY_PID=$VDISPLAY_PID" >> "$GITHUB_ENV"
           sleep 3
+          kill -0 "$VDISPLAY_PID"
 
       - name: Run workspace churn typing-lag regression
         run: |
@@ -393,7 +394,16 @@ jobs:
           CMUX_LAG_KEY_EVENTS=180 \
           python3 tests/test_workspace_churn_up_arrow_lag.py
 
-  ui-display-resolution-regression:
+      - name: Cleanup virtual display
+        if: always()
+        run: |
+          set -euo pipefail
+          if [ -n "${VDISPLAY_PID:-}" ]; then
+            kill "$VDISPLAY_PID" >/dev/null 2>&1 || true
+          fi
+          rm -f /tmp/create-virtual-display
+
+  ui-regressions:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository
     runs-on: warp-macos-15-arm64-6x
     timeout-minutes: 25
@@ -445,8 +455,8 @@ jobs:
         uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4
         with:
           path: .ci-source-packages
-          key: spm-ui-display-resolution-${{ hashFiles('GhosttyTabs.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved') }}
-          restore-keys: spm-ui-display-resolution-
+          key: spm-ui-regressions-${{ hashFiles('GhosttyTabs.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved') }}
+          restore-keys: spm-ui-regressions-
 
       - name: Resolve Swift packages
         run: |
@@ -491,3 +501,15 @@ jobs:
             -destination "platform=macOS" \
             -only-testing:cmuxUITests/DisplayResolutionRegressionUITests \
             test
+
+      - name: Run browser find focus UI regression
+        run: |
+          set -euo pipefail
+          SOURCE_PACKAGES_DIR="$PWD/.ci-source-packages"
+          xcodebuild -project GhosttyTabs.xcodeproj -scheme cmux -configuration Debug \
+            -clonedSourcePackagesDirPath "$SOURCE_PACKAGES_DIR" \
+            -disableAutomaticPackageResolution \
+            -destination "platform=macOS" \
+            -maximum-test-execution-time-allowance 120 \
+            -only-testing:cmuxUITests/BrowserPaneNavigationKeybindUITests/testCmdFFocusesBrowserFindFieldAfterCmdDCmdLNavigation \
+            test

.github/workflows/test-e2e.yml

@@ -217,9 +217,7 @@ jobs:
             clang -framework Foundation -framework CoreGraphics \
               -o "$HELPER_PATH" scripts/create-virtual-display.m
 
-            cat >"$MANIFEST_PATH" <<EOF
-            {"helperBinaryPath":"$HELPER_PATH"}
-            EOF
+            printf '%s\n' "{\"helperBinaryPath\":\"$HELPER_PATH\"}" > "$MANIFEST_PATH"
           fi
 
           # Start recording right before the test (after build/resolve).

Sources/AppDelegate.swift

@@ -12463,6 +12463,13 @@ private extension NSWindow {
         in window: NSWindow,
         event: NSEvent?
     ) -> CmuxWebView? {
+        // Browser find runs in the portal slot alongside the hosted WKWebView.
+        // Treat its native field editor chain as browser chrome, not as web content,
+        // so Cmd+F can move first responder into the find field while web focus is suppressed.
+        if BrowserWindowPortalRegistry.searchOverlayPanelId(for: responder, in: window) != nil {
+            return nil
+        }
+
         if let webView = cmuxOwningWebView(for: responder) {
             return webView
         }

Sources/BrowserWindowPortal.swift

@@ -1777,13 +1777,38 @@ final class WindowBrowserSlotView: NSView {
         logSearchOverlayEvent("create", panelId: configuration.panelId)
     }
 
+    private func searchOverlayOwnsFieldEditor(_ fieldEditor: NSTextView, in root: NSView) -> Bool {
+        guard fieldEditor.isFieldEditor else { return false }
+
+        if let textField = root as? NSTextField, textField.currentEditor() === fieldEditor {
+            return true
+        }
+
+        for subview in root.subviews {
+            if searchOverlayOwnsFieldEditor(fieldEditor, in: subview) {
+                return true
+            }
+        }
+
+        return false
+    }
+
     func searchOverlayPanelId(for responder: NSResponder) -> UUID? {
-        guard let overlay = searchOverlayHostingView,
-              let view = responder.browserPortalOwningView,
-              view.isDescendant(of: overlay) else {
-            return nil
+        guard let overlay = searchOverlayHostingView else { return nil }
+
+        let panelId = objc_getAssociatedObject(overlay, &cmuxBrowserSearchOverlayPanelIdAssociationKey) as? UUID
+
+        if let view = responder as? NSView,
+           view === overlay || view.isDescendant(of: overlay) {
+            return panelId
         }
-        return objc_getAssociatedObject(overlay, &cmuxBrowserSearchOverlayPanelIdAssociationKey) as? UUID
+
+        if let fieldEditor = responder as? NSTextView,
+           searchOverlayOwnsFieldEditor(fieldEditor, in: overlay) {
+            return panelId
+        }
+
+        return nil
     }
 
     @discardableResult