MacOS external monitor

[Paul Gilmartin]

/Users/paulgilm/work/Installers/astro/Stellarium-I/Stellarium-25.2-qt6-macOS/Stellarium.app/Contents/MacOS/stellarium

[ 0.454][INFO]
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[ 0.454][INFO] [ This is Stellarium 25.2 (v25.2.0) -
https://stellarium.org/ ]
[ 0.454][INFO] [ Copyright (C) 2000-2025 Stellarium Developers
]
[ 0.454][INFO]
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[ 0.454][INFO] 2025-06-22T10:49:19
[ 0.454][INFO] Operating System: macOS 15.5
[ 0.454][INFO] Platform: cocoa
[

config.ini:
...
flag_show_fullscreen_button = true
...
fullscreen = false
...
With a large HDMI monitor (TV) attached. I launch
S 25.2 with the main window in the Mac display.

I drag that window to the external display. Operations
seem normal.seem normal.

I click fullscreen_button. Window expands to fill the
external display. Operations continue normally, but,
I click fullscreen_button again. The main window shrinks
momentarily to regular size, then vanishes forever.
Exposé gestures show it, but I can't bring it to
foreground. I can only Quit with Exposé.

This misbehavior exists in 25.1. In noticed it only
trying 25.2 today.

Firefox, where fullscreen_button is the green button in
the title bar shows no such misbehavior.

--
Thanks,
gil