feat: Implement background shell commands (#14849)

packages/cli/src/ui/components/InputPrompt.tsx

@@ -152,8 +152,14 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
   const kittyProtocol = useKittyKeyboardProtocol();
   const isShellFocused = useShellFocusState();
   const { setEmbeddedShellFocused } = useUIActions();
-  const { terminalWidth, activePtyId, history, terminalBackgroundColor } =
-    useUIState();
+  const {
+    terminalWidth,
+    activePtyId,
+    history,
+    terminalBackgroundColor,
+    backgroundShells,
+    backgroundShellHeight,
+  } = useUIState();
   const [justNavigatedHistory, setJustNavigatedHistory] = useState(false);
   const escPressCount = useRef(0);
   const [showEscapePrompt, setShowEscapePrompt] = useState(false);
@@ -915,7 +921,10 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
 
       if (keyMatchers[Command.FOCUS_SHELL_INPUT](key)) {
         // If we got here, Autocomplete didn't handle the key (e.g. no suggestions).
-        if (activePtyId) {
+        if (
+          activePtyId ||
+          (backgroundShells.size > 0 && backgroundShellHeight > 0)
+        ) {
           setEmbeddedShellFocused(true);
         }
         return true;
@@ -967,6 +976,8 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
       onSubmit,
       activePtyId,
       setEmbeddedShellFocused,
+      backgroundShells.size,
+      backgroundShellHeight,
       history,
     ],
   );