Fix Live leaving blank line for empty renderables

CHANGELOG.md

@@ -1,3 +1,8 @@
+### Added
+
+- Fixed `Live(transient=True)` leaving a blank line when the renderable produces no output.
+
+
 # Changelog
 
 All notable changes to this project will be documented in this file.

CONTRIBUTORS.md

@@ -94,3 +94,4 @@ The following people have contributed to the development of Rich:
 - [Jonathan Helmus](https://github.com/jjhelmus)
 - [Brandon Capener](https://github.com/bcapener)
 - [Alex Zheng](https://github.com/alexzheng111)
+- [Mohammed Faheem](https://github.com/Faheem12005)

rich/live.py

@@ -166,7 +166,11 @@ def stop(self) -> None:
                 finally:
                     self._disable_redirect_io()
                     self.console.pop_render_hook()
-                    if not self._alt_screen and self.console.is_terminal:
+                    if (
+                        not self._alt_screen
+                        and self.console.is_terminal
+                        and self._live_render.has_rendered_rows()
+                    ):
                         self.console.line()
                     self.console.show_cursor(True)
                     if self._alt_screen:

rich/live_render.py

@@ -1,5 +1,4 @@
-from typing import Optional, Tuple, Literal
-
+from typing import Literal, Optional, Tuple
 
 from ._loop import loop_last
 from .console import Console, ConsoleOptions, RenderableType, RenderResult
@@ -59,6 +58,17 @@ def position_cursor(self) -> Control:
             )
         return Control()
 
+    def has_rendered_rows(self) -> bool:
+        """Check if there are any rendered rows.
+
+        Returns:
+            bool: True if there are rendered rows, False otherwise.
+        """
+        if self._shape is not None:
+            _, height = self._shape
+            return height > 0
+        return False
+
     def restore_cursor(self) -> Control:
         """Get control codes to clear the render and restore the cursor to its previous position.
 

tests/test_live_render.py

@@ -1,8 +1,9 @@
 import pytest
-from rich.live_render import LiveRender
+
 from rich.console import Console, ConsoleDimensions, ConsoleOptions
-from rich.style import Style
+from rich.live_render import LiveRender
 from rich.segment import Segment
+from rich.style import Style
 
 
 @pytest.fixture
@@ -28,6 +29,14 @@ def test_restore_cursor(live_render):
     assert str(live_render.restore_cursor()) == "\r\x1b[1A\x1b[2K\x1b[1A\x1b[2K"
 
 
+def test_has_rendered_rows(live_render):
+    assert live_render.has_rendered_rows() is False
+    live_render._shape = (80, 0)
+    assert live_render.has_rendered_rows() is False
+    live_render._shape = (80, 1)
+    assert live_render.has_rendered_rows() is True
+
+
 def test_rich_console(live_render):
     options = ConsoleOptions(
         ConsoleDimensions(80, 25),