Files
glib/gio
Marco Trevisan (Treviño) c6ace7aaf7 gio/cancellable: Fix comments for g_cancellable_connect()
We had wrong comments, in particular:

  @callback is called exactly once each time @cancellable is cancelled,
  either directly at the time of the connect if @cancellable is already
  cancelled, or when @cancellable is cancelled in some thread.
  In case the cancellable is reset via [method@Gio.Cancellable.reset]
  then the callback can be called again if the @cancellable is cancelled

This is not true if `@cancellable` is already cancelled because then the
callback will be thrown away, and will not be called for subsequent
cancellations.

  Since GLib 2.40, the lock protecting @cancellable is not held when
  @callback is invoked.  This lifts a restriction in place for
  earlier GLib versions which now makes it easier to write cleanup
  code that unconditionally invokes e.g. g_cancellable_cancel().

As per commit 3a07b2abd4 this section needs some amending since
it's not true anymore, as the GCancellable's mutex is held when `@callback` is
invoked. However this happens in a way that it's still safe to call most
of the GCancellable API.

Closes: #3642
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