If the lower pane of the main view is asked to show a diff and is then
emptied before the next layout, it ends up holding the diff. Selecting
a file with staged changes and moving back to one without any in rapid
succession does this. The pane is hidden then, but when it is shown
again, it shows the other file's diff until its next render replaces
it.
Emptying a pane clears the view right away, but leaves the view's tasks
alone. So the diff's task, which is only created after the layout,
fills the pane again. A task that is still reading a diff into the pane
isn't stopped either, so it can write into the emptied view.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>