Use Textual's TextArea.code_editor if available

Textual 0.48 introduces a breaking change for the `TextArea` widget:
line wrapping is now enabled by default. Since we don't want line
wrapping, we need to disable that. Fortunately, a new alternative
constructor called `TextArea.code_editor` is introduced, and
constructing the `TextArea` using it retains the old behavior.
Unfortunately, that alternative constructor didn't exist prior to
Textual 0.48, so we need to conditionally fall back to simply using the
`TextArea` constructor when `TextArea.code_editor` doesn't exist.

Signed-off-by: Matt Wozniski <mwozniski@bloomberg.net>

Author: godlygeek

src/memray/reporters/tree.py

@@ -174,7 +174,9 @@ def compose(self) -> ComposeResult:
         else:
             lines = []
 
-        text = TextArea(
+        # For Textual 0.48 and up, use the TextArea.code_editor() constructor.
+        # This used to be the default, so fall back to the main constructor.
+        text = getattr(TextArea, "code_editor", TextArea)(
             "\n".join(lines), language="python", theme="dracula", id="textarea"
         )
         text.select_line(delta + 1)