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

[Stephen Kitt]

Hi Simon,

On Mon, Feb 05, 2018 at 12:36:06PM +0100, Simon McVittie wrote:
> 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.

Yes, thanks, I was aware of that ;-). There are a number of problems
in gweled around the troublesome RSVG call, notably forgetting to
initialise the error pointer to NULL, and then calling g_free on it,
which crashes gweled when an error actually occurs...

I’m fixing all that in gweled, which will still leave the RSVG
regression.

Regards,

Stephen
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