Begin-rescue block results in a double free or corruption error with Gdk::Texture

[BigBoyBarney]

This is a follow-up issue from #74, possibly related.

The following code crashes with the error if GC.collect is run.

double free or corruption (fasttop)                 
Program received and didn't handle signal ABRT (6)

class MainWindow < Adw::ApplicationWindow
  def initialize(application : Adw::Application)
    super(application: application)
    KEEP_ALIVE << self

    begin
      texture = Gdk::Texture.new_from_filename("")
    rescue
    end

    button = Gtk::Button.new(label: "GC collect")

    button.clicked_signal.connect do
      GLib.idle_add do
        GC.collect
        false
      end
    end

    self.content = button
  end
end

The path to the file used for Gdk::Texture does not matter, as long as it doesn't exist. Without the begin block, the app exits with a GLib::Error and an invalid memory access even without running GC.collect.

Unhandled exception: Operation not supported (GLib::Error)
Invalid memory access (signal 11) at address 0x0

Notice how texture doesn't have to be called at all. Replacing the begin-rescue block with a File.exists? check goes around the issue.

Another interesting thing is that

Gtk::Picture.new_for_filename("")

does not suffer from the same issue.