[Xfce-bugs] [Bug 12493] Usage "Open with …" menu item in thunar unexpectedly changes default application for opened file's MIME

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=12493

--- Comment #2 from xfcebugzilla at firmgently.co.uk ---
(In reply to xfcebugzilla from comment #1)
> I noticed the same problem with .jpg files. My default app is Ristretto
> Image Viewer. If I use 'open with' to open a .jpg in XnConvert, the default
> seems to change (ie. doubleclicking now opens in XnConvert...until I use
> 'open with' Ristretto, then Ristretto becomes default). So - same behaviour
> as already reported.
> 
> However, last night I noticed the behaviour *isn't* happening with some file
> types. I can open a .js or a .php file in Atom via the 'open with' flyout,
> then afterwards if I doubleclick a .js or .php file it still opens in Pluma
> (the default, so in this case default didn't get changed by using 'open
> with').
> 
> ToZ on this thread https://forum.xfce.org/viewtopic.php?pid=42309#p42309
> mentions:
> "g-app-info-set-as-last-used-for-type which:
> 
>     Sets the application as the last used application for a given type. This
> will make the application appear as first in the list returned by
> g_app_info_get_recommended_for_type(), regardless of the default application
> for that content type."
> 
> As a blind hypothesis, I wonder if there's a last-used-for-type and a
> proper-default-for-type and if proper-default isn't set it falls back to
> last-used-for-type?
> 
> If so then maybe the behaviour is by-design but just not made very clear?
> I'm completely guessing.

EDITED TO ADD:

Ok I just went and specifically set .jpg to open in Ristretto in MIME Type
Editor. Now I can use 'open with' in XnConvert, close it, doubleclick a .jpg
and it opens in Ristretto.

So the 'fix' for this is to specifically set a default in MIME Type Editor.
Presumably this means this behaviour is by-design (but I'd also humbly offer
that it isn't very clear to the user). It also sounds like the fallback idea
mentioned above might be what's happening.

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