[vala/0.38] vala: Include sender-type parameter to prototype-string of signal-delegates

[Rico Tzschichholz <ricotz src gnome org>]

commit 2ac63a8f0d80cfba5a33c2be38cc1dd0ad8d32af
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Sep 10 15:48:53 2017 +0200

    vala: Include sender-type parameter to prototype-string of signal-delegates
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787521

 vala/valacallabletype.vala |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/vala/valacallabletype.vala b/vala/valacallabletype.vala
index 1646b44..0642fa6 100644
--- a/vala/valacallabletype.vala
+++ b/vala/valacallabletype.vala
@@ -44,6 +44,15 @@ public abstract class Vala.CallableType : DataType {
                // Append parameter-list
                builder.append_c ('(');
                int i = 1;
+               // add sender parameter for internal signal-delegates
+               var delegate_type = this as DelegateType;
+               if (delegate_type != null) {
+                       var delegate_symbol = delegate_type.delegate_symbol;
+                       if (delegate_symbol.parent_symbol is Signal && delegate_symbol.sender_type != null) {
+                               builder.append (delegate_symbol.sender_type.to_qualified_string ());
+                               i++;
+                       }
+               }
                foreach (Parameter param in get_parameters ()) {
                        if (i > 1) {
                                builder.append (", ");