fix: 'Invalid window id ...' error when restoring a session saved with an invisible Scratch Window (#430)

[tadashi-aikawa]

📃 Summary

Please see #430

closes #430

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[shortcuts]

Thanks, the changes looks great I've been using it for a few hours and did not noticed unexpected behaviors.

Do you have a way to consistently reproduce the error you've described in #430? It could be great to add a test case in https://github.com/shortcuts/no-neck-pain.nvim/blob/main/tests/test_colors.lua

[tadashi-aikawa]

@shortcuts
Thank you for confirming!

The issue can be reproduced by following the steps to reproduce and running the specified commands. However, whether the scratch window becomes hidden may depend on the terminal environment (e.g., resolution, font size, etc.). In my case, it was reproduced in a Full HD full-screen display.

[shortcuts]

I've added f34e4dc to assert the changes, however I'm not able to make it fail on main so far, I'll take an other look tomorrow!

[tadashi-aikawa]

@shortcuts
I have set width = 140, but I suspect the test code is set to width = 50. If that's the case, the scratch window might appear, which could explain why the issue is not reproducible.