Cannot comment on diffs when shown

### What happened

When using deck, the highlights are not working and so does the comments.

1. When I drag on comments, nothing gets selected.
2. I cannot comment on diffs

### Version

0.0.9

### Platform

macOS

### Which editor's theme

_No response_

### Where deck looked

```text

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### Did the window close on its own?

```text

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Reproduce the issue in deck 0.0.9 on macOS while viewing a diff, checking both highlight selection by dragging and comment creation. Done means diff ranges can be selected and comments can be added reliably.

Written by the indexing model from the issue text.