Bug#886833: [gweled] Not compatable with recent gtk

[Simon McVittie]

On Sun, 04 Feb 2018 at 16:16:14 +0200, Juhani Numminen wrote:
> (gweled:2987): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
> This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
> The overwriting error message was: Operation not supported

Regardless of whether there's been an incompatible behaviour change,
this warning indicates a bug in either gweled or a library that it
uses. GErrors are like exceptions; after calling some function that
fails, you must either propagate the error to your caller, or clear the
error indicator (usually with g_clear_error()) to indicate that it has
been handled.

G_DEBUG=fatal-warnings is sometimes useful to pin down the cause for
warnings like this by turning them into fatal errors that leave a core
dump.

    smcv