GWL: Set reasonable min width for panel item ...

[fredcw]

... in case application icon is missing.

Fixes: #12307

[mtwebster]

If the application icon is missing there should be a placeholder/missing-image icon, not an empty space - I don't think this is a good way to address that issue.

[fredcw]

The problem is that app.create_icon_texture_for_window() and app.create_icon_texture() return an StIcon with no indication that the icon is missing and I don't see any obvious way to detect that. I have the same problem in Cinnamenu. I'll have another look later to see if I can find a way to do it.

[fredcw]

Ah, it seems that both app.create_icon_texture_for_window() and app.create_icon_texture() should return the icon application-x-executable where no other icon is found. But these don't seem to be working reliably.

[mtwebster]

I think since the example app/theme (breeze/alacarte) are defined and have a matching desktop file (so are not window-backed), we're calling cinnamon_app_create_icon_texture ().

That gets the icon info from the GAppInfo (the desktop file representation) and never check if it's available before returning a useless StIcon.

This could be fixed easily in StIcon (checking the theme for the icon before trying to use it) but we'd lose the ability to have different context-dependent fallback icons (default app icon for gwl, missing image icon in other places, etc...).

It makes the most sense to check this as part of cinnamon_app_create_icon_texture () maybe using gtk_icon_theme_lookup_by_gicon (), but desktop files can also use an absolute path for their Icon entry - now you're checking if a file exists, which is racy...

I don't have a good answer yet lol I was just digging a bit.

[fredcw]

I think I have a solution. On line https://github.com/linuxmint/cinnamon/blob/master/src/cinnamon-app.c#L188 instead of g_themed_icon_new, use g_themed_icon_new_from_names.

I'm not sure how to do it in C but in JS I can use Gio.ThemedIcon.new_from_names(['bob','application-x-executable']) instead of Gio.ThemedIcon.new('bob') to get the 'application-x-executable' icon if 'bob' doesn't exist.

[fredcw]

Actually, this only solves the problem for cinnamon_app_create_icon_texture_for_window but not for cinnamon_app_create_icon_texture.

In cinnamon_app_create_icon_texture, line 303:

icon = g_app_info_get_icon (G_APP_INFO (app->info));

also returns an invalid gicon.