The 'selection-changed' signal is emitted unconditionally, even in the case
when there is no selection to be cleared. As a result, the subscriber receives
the initial signal and if he calls gtk_file_chooser_get_uri(), no value is
currently selected.
This might happen for slow filesystems where a fast-content-type might
be provided instead. Don't try to manipulate that content_type if it's
NULL, otherwise we'll either throw warnings (at best) or crash (at
worse).
If NULL is returned, probably the client shouldn't advertise the
mimetype. Make it sure we forget entirely about the attempt to
cache this mimetype, as it'll be mistaken as pending otherwise.
Dropping this cached selection will in consequence close the fd
of all pending readers, which seems appropriate for NULL content.
https://gitlab.gnome.org/GNOME/gtk/issues/2456
The only way to have G_IO_ERROR_CANCELLED in the write callback
goes through having the array of pending writers already cleared.
It should not access the invalid AsyncWriteData and StoredSelection
in that case.
.osd suggests a particular color/background/hover style, while .circular
only suggests roundness. So for buttons that use both classes, make sure
the former takes precedence with regard to background/hover.
gdk_window_impl_quartz_release_context () can be called with a NULL CGContextRef. This causes CoreGraphics assertion failures when debugging a Gtk application in Xcode, as the code was blindly passing that NULL to CGContextRestoreGState () and CGContextSetAllowsAntialiasing (). Given that the matching pair of CGContextSaveGState () and CGContextSetAllowsAntialiasing () calls are already checking for a NULL CGContextRef, it seems reasonable to wrap these calls in a NULL check.
Cache separately the selection contents for each given window/selection/atom
combination, and keep the requestors separate for each of those.
This allows us to incrementally request multiple mimetypes, and dispatch
the requestors as soon as the data is up. This stored selection content is
cached until the selection owner changes, at which point all pending readers
could get their transfers cancelled, and the stored content for the selection
forgotten.
