/diff is hiding some lines seemingly at random

[simonrozsival]

Describe the bug

I noticed sometimes the diff is not showing all lines:

The line 193 is not showing! The line "appears" (it's still looks like it's under the "original" line) when I move my cursor to the missing line:

Git diff shows this code section just fine, I also can't see any weird characters in hexedit:

                internal static JniRuntime.JniValueManager CreateValueManager ()
                {
                        if (RuntimeFeature.IsMonoRuntime) {
                                return new AndroidValueManager ();
                        }

                        if (RuntimeFeature.IsCoreClrRuntime || RuntimeFeature.IsNativeAotRuntime) {
                                return new JavaMarshalValueManager ();
                        }

                        throw new NotSupportedException ("Internal error: unknown runtime not supported");
                }

I noticed that different lines disappear as I scroll. As I scroll, the line 193 appears, but now line 196 is hidden:

Affected version

GitHub Copilot CLI 1.0.42-0.

Steps to reproduce the behavior

The bug appears seemingly at random, I don't know how to reliably reproduce it.

Expected behavior

All lines are shown in the diff.

Additional context

• macOS
• ghostty