Show loading screen on startup

[orende]

Description

Adds a loading screen (splash screen) that is shown during application startup so that the application does not appear unresponsive if e.g. the network is slow. I moved most of the heavy initialization work from the Window class constructor to the library.initialize() method. In order to get the splash screen to work, some changes to initialization order had to be done in the minigalaxy file, and the initialization in the Library class had to be moved to a thread so that the GTK initialization was not blocked.

Additionally, the related unit tests were updated, an AI-generated splash screen image was added and two additional useless game ids were added to the constants.py file.

This PR solves #575 .

Checklist

• CHANGELOG.md was updated (format: - Change made (thanks to github_username))

[sharkwouter]

I'm seeing some issues on my system. First time I started it, Minigalaxy froze and the main window was not shown at all. Now I've tried again a couple of times and I'm seeing this:

wouter@wouter-gridscale:~/Personal/minigalaxy$ bin/minigalaxy 

(minigalaxy:31402): Gtk-CRITICAL **: 11:21:59.893: gtk_widget_get_toplevel: assertion 'GTK_IS_WIDGET (widget)' failed

(minigalaxy:31402): Gtk-CRITICAL **: 11:21:59.893: _gtk_widget_captured_event: assertion 'WIDGET_REALIZED_FOR_EVENT (widget, event)' failed
wouter@wouter-gridscale:~/Personal/minigalaxy$ bin/minigalaxy 

(minigalaxy:31444): Gdk-ERROR **: 11:22:08.672: The program 'minigalaxy' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadImplementation (server does not implement operation)'.
  (Details: serial 528 error_code 17 request_code 20 (core protocol) minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/breakpoint trap (core dumped)

I think there is an issue with multithreading again. Threads outside of the main thread cannot use gtk objects without potentially causing crashes. Using Glib.idle_add prevents this issue, by scheduling it on the main thread. I'm not sure if the main thread does not get stuck somewhere, though.

[sharkwouter]

Could you use the Minigalaxy logo that's used for the about window instead of this one?

[orende]

Will do.

[sharkwouter]

I was testing this on Ubuntu 22.04. Just so you know. When I tested this on Debian earlier, it was working. It's a bit odd.

[sharkwouter]

Sorry it took this long to review this. I really appreciate the work! Thanks!

[orende]

Thanks for the review! I suspect there could be a race condition where the GTK work is sometimes done on the main thread (and working as expected) and sometimes done on a separate thread (and crashing). I will do another pass through the code and use GTK.idle_add where necessary. I will also replace the image.

…

On Thu, 5 Oct 2023, 11:26 Wouter Wijsman, ***@***.***> wrote: I was testing this on Ubuntu 20.04. Just so you know. When I tested this on Debian earlier, it was working. It's a bit odd. — Reply to this email directly, view it on GitHub <#581 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAOGO5KANTCEQVUWML27LATX5Z4MZAVCNFSM6AAAAAA4OQFWF2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTONBYGQ3TGMZZGU> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[orende]

After moving the GUI-related function calls in library.initialize() to GLib.idle_add, I started having trouble with credentials not being shared across threads. Still investigating that, but haven't had much time to spend on it lately.

[sharkwouter]

Thanks for the update! I appreciate the work you put in this. I'm sorry for not getting back to you earlier, I had quite the situation in my private life. Now I'll be able to support you again, though, so let me know if I can do anything.