appchooserdialog: Don't fire notify::heading twice
The gtk_app_chooser_dialog_set_heading() function do emit notify::heading. Since the setter simply calls the function, the setter itself shouldn't emit a notify signal by itself.
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@ -685,7 +685,8 @@ gtk_app_chooser_dialog_class_init (GtkAppChooserDialogClass *klass)
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P_("Heading"),
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P_("The text to show at the top of the dialog"),
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NULL,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
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G_PARAM_EXPLICIT_NOTIFY);
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g_object_class_install_property (gobject_class, PROP_HEADING, pspec);
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/* Bind class to template
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