fix(linux): call gtk_init to fix tauri-apps/tauri#11312

[FabioGNR]

This fixes tauri-apps/tauri#11312, this issue also contains some more information regarding this change.

To summarize, on Linux a crash is seen where gtk-rs fails an assert with error message "GTK may only be used from the main thread".

In tao, gtk::Application::new is used which should remove the need for calling gtk::init(). I believe there's a bug here, in either gtk-rs or gtk itself, but I've been unable to check this so far, where gtk::init() is not called or gtk-rs' internal INITIALIZED variable is not updated.

Later on at attempted use of a GTK function we get the failed assert and crash afterwards.

Adding an explicit gtk::init() call here fixes this issue. Calling this function multiple times should have no negative side effects, as there is a check to skip initializing when already done.

There are some unknowns:

• Why was this introduced around 2.0.0? Did something previously call gtk_init through some (indirect) path?
• Why does gtk::Application::new not work as expected?

Reference documentation:

• https://docs.gtk.org/gtk3/ctor.Application.new.html
• https://docs.gtk.org/gio/method.Application.register.html
• https://github.com/gtk-rs/gtk3-rs/blob/master/gtk/src/application.rs
• https://github.com/gtk-rs/gtk3-rs/blob/master/gtk/src/rt.rs

[github-actions]

Package Changes Through 12a0a18

There are 1 changes which include tao with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
tao	0.31.0	0.31.1

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