Opening Log Detail window causes main window to spin (commit 8636e29)

[philrz]

I've narrowed down via binary search that this bug seemed to crop up at commit 8636e29 (associated with #1150, cc: @mason-fish).

Repro is with the attached hello.pcapng.zip (unzip before importing). Per the attached video, when I click on an event (such as the conn one as shown here) to bring up the Log Detail in a separate window, the main window becomes a never-ending spinner.

Repro.zip

[philrz]

Verified in Brim commit adba0d6.

Repeating the repro steps as shown in the attached video, now the Log Details window opens up without causing the main window to start spinning.

Verify.zip

Thanks @mason-fish!