Add a priority field for mail formatter and parser extensions.

Add a priority field to EMailFormatterExtension and EMailParserExtension
class structs.  Extension classes can then explicitly specify a priority
with respect to other extension classes with the same MIME type, so that
the order of extension registration doesn't matter.

Priority field defaults to G_PRIORITY_DEFAULT.  Built-in formatters and
extensions will use G_PRIORITY_LOW.  We can get more sophisticated with
priority values if we need to, but this should suffice for now.

1 files changed, 1 insertions, 0 deletions

diff --git a/em-format/e-mail-formatter-secure-button.c b/em-format/e-mail-formatter-secure-button.c
index 8f66b2ee42..571b90d220 100644
--- a/em-format/e-mail-formatter-secure-button.c
+++ b/em-format/e-mail-formatter-secure-button.c
@@ -464,6 +464,7 @@ static void
 e_mail_formatter_secure_button_class_init (EMailFormatterExtensionClass *class)
 {
 	class->mime_types = formatter_mime_types;
+	class->priority = G_PRIORITY_LOW;
 	class->format = emfe_secure_button_format;
 	class->get_widget = emfe_secure_button_get_widget;
 }