fix: Add ability to scroll up and copy

CLAUDE.md

@@ -8,3 +8,8 @@
 - Use `asyncio` features, if such is needed
 - Prefer early returns
 - Absolutely no useless comments! Every class and method does not need to be documented (unless it is legitimetly complex or "lib-ish")
+- Imports belong at the top of files, not inside functions (unless needed to avoid circular imports)
+
+## Testing Rules
+
+- **Never delete behavior tests to make things pass.** Fix the code or update the tests to reflect new behavior

src/agent_chat_cli/components/user_input.py

@@ -2,6 +2,7 @@
 from textual.app import ComposeResult
 from textual.widgets import TextArea
 from textual.binding import Binding
+from textual.events import DescendantBlur
 
 from agent_chat_cli.components.caret import Caret
 from agent_chat_cli.components.flex import Flex
@@ -10,8 +11,6 @@
 
 
 class UserInput(Widget):
-    first_boot = True
-
     BINDINGS = [
         Binding("enter", "submit", "Submit", priority=True),
     ]
@@ -33,6 +32,10 @@ def on_mount(self) -> None:
         input_widget = self.query_one(TextArea)
         input_widget.focus()
 
+    def on_descendant_blur(self, event: DescendantBlur) -> None:
+        if isinstance(event.widget, TextArea):
+            event.widget.focus(scroll_visible=False)
+
     async def on_key(self, event) -> None:
         if event.key == "ctrl+j":
             event.stop()

src/agent_chat_cli/core/ui_state.py

@@ -4,6 +4,7 @@
 
 from agent_chat_cli.components.thinking_indicator import ThinkingIndicator
 from agent_chat_cli.components.tool_permission_prompt import ToolPermissionPrompt
+from agent_chat_cli.components.user_input import UserInput
 
 if TYPE_CHECKING:
     from agent_chat_cli.app import AgentChatCLIApp
@@ -39,8 +40,6 @@ def stop_thinking(self, show_cursor: bool = True) -> None:
     def show_permission_prompt(
         self, tool_name: str, tool_input: dict[str, Any]
     ) -> None:
-        from agent_chat_cli.components.user_input import UserInput
-
         thinking_indicator = self.app.query_one(ThinkingIndicator)
         thinking_indicator.is_thinking = False
 
@@ -53,13 +52,20 @@ def show_permission_prompt(
         user_input.display = False
 
     def hide_permission_prompt(self) -> None:
-        from agent_chat_cli.components.user_input import UserInput
-
         permission_prompt = self.app.query_one(ToolPermissionPrompt)
         permission_prompt.is_visible = False
 
         user_input = self.app.query_one(UserInput)
         user_input.display = True
 
-        input_widget = self.app.query_one(TextArea)
+        self.focus_input()
+
+    def focus_input(self) -> None:
+        user_input = self.app.query_one(UserInput)
+        input_widget = user_input.query_one(TextArea)
         input_widget.focus()
+
+    def clear_input(self) -> None:
+        user_input = self.app.query_one(UserInput)
+        input_widget = user_input.query_one(TextArea)
+        input_widget.clear()

tests/core/test_ui_state.py

@@ -139,3 +139,27 @@ async def test_hide_permission_prompt(self, mock_agent_loop, mock_config):
 
             assert prompt.is_visible is False
             assert user_input.display is True
+
+
+class TestUIStateInput:
+    async def test_focus_input(self, mock_agent_loop, mock_config):
+        app = AgentChatCLIApp()
+        async with app.run_test():
+            user_input = app.query_one(UserInput)
+            text_area = user_input.query_one(TextArea)
+            text_area.blur()
+
+            app.ui_state.focus_input()
+
+            assert text_area.has_focus is True
+
+    async def test_clear_input(self, mock_agent_loop, mock_config):
+        app = AgentChatCLIApp()
+        async with app.run_test():
+            user_input = app.query_one(UserInput)
+            text_area = user_input.query_one(TextArea)
+            text_area.insert("some text")
+
+            app.ui_state.clear_input()
+
+            assert text_area.text == ""