offsets fix

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## Unlreleased
+
+### Fixed
+
+- Fixed selection to the right of code fence blocks (may break some snapshots)
+
 ## [8.2.5] - 2026-04-30
 
 ### Added

src/textual/_compositor.py

@@ -937,13 +937,16 @@ def get_widget_and_offset_at(
 
         from rich.cells import get_character_cell_size
 
+        offset: Offset | None = None
         for segment in line:
             end += segment.cell_length
             style = segment.style
             if style is not None and style._meta is not None:
                 meta = style.meta
                 if "offset" in meta:
-                    offset_x, offset_y = style.meta["offset"]
+                    offset_x, offset_y = meta["offset"]
+                    if offset_y is None:
+                        continue
                     offset_x2 = offset_x + len(segment.text)
 
                     if x < end and x >= start:
@@ -955,14 +958,14 @@ def get_widget_and_offset_at(
                                 break
                             segment_cell_length += get_character_cell_size(character)
                             segment_offset += 1
-                        return widget, (
-                            None
-                            if offset_y is None
-                            else Offset(offset_x + segment_offset, offset_y)
-                        )
+
+                        offset = Offset(offset_x + segment_offset, offset_y)
+                        break
             start = end
 
-        return widget, (None if offset_y is None else Offset(offset_x2, offset_y))
+        if offset is None and offset_y is not None:
+            offset = Offset(offset_x2, offset_y)
+        return widget, offset
 
     def find_widget(self, widget: Widget) -> MapGeometry:
         """Get information regarding the relative position of a widget in the Compositor.

src/textual/widgets/_markdown.py

@@ -940,7 +940,7 @@ def set_content(self, content: Content) -> None:
             self.query_one("#code-content", Label).update(content)
 
     def compose(self) -> ComposeResult:
-        yield Label(self._highlighted_code, id="code-content")
+        yield Label(self._highlighted_code, id="code-content", expand=True)
 
 
 NUMERALS = " ⅠⅡⅢⅣⅤⅥ"