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--- libunity-7.1.4/protocol/protocol-icon.vala.debug	2019-03-19 19:17:56.000000000 +0900
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+++ libunity-7.1.4/protocol/protocol-icon.vala	2021-09-13 22:11:06.634930969 +0900
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@@ -185,7 +185,7 @@ public class AnnotatedIcon : Object, GLi
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   }
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   /* Added to GIcon interface in 2.37 */
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-  private Variant serialize ()
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+  private Variant? serialize ()
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   {
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     Variant? ret = null;
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     return ret;
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--- libunity-7.1.4/src/unity-scope-channel.vala.debug	2019-03-19 19:18:05.000000000 +0900
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+++ libunity-7.1.4/src/unity-scope-channel.vala	2021-09-13 22:16:25.440323188 +0900
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@@ -312,7 +312,7 @@ internal class ScopeChannel : Object
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           DBusSignalFlags.NONE, this.owner_changed);
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     }
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-    private void owner_changed (DBusConnection con, string sender_name,
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+    private void owner_changed (DBusConnection con, string? sender_name,
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                                 string obj_path, string ifc_name,
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                                 string sig_name, Variant parameters)
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     {