Fix double-paste into Input

See #1657.

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Fixed stuck screen  https://github.com/Textualize/textual/issues/1632
 - Fixed relative units in `grid-rows` and `grid-columns` being computed with respect to the wrong dimension https://github.com/Textualize/textual/issues/1406
+- Fixed double-paste into `Input` https://github.com/Textualize/textual/issues/1657
 
 ## [0.10.1] - 2023-01-20
 

src/textual/widgets/_input.py

@@ -256,6 +256,7 @@ class Input(Widget, can_focus=True):
     def on_paste(self, event: events.Paste) -> None:
         line = event.text.splitlines()[0]
         self.insert_text_at_cursor(line)
+        event.stop()
 
     def on_click(self, event: events.Click) -> None:
         offset = event.get_content_offset(self)