[smuxi/stable: 14/15] Frontend-GNOME: fix method not found exception on Win32

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit e0464410b746012325beee706f1340ddcff1a653
Author: Mirco Bauer <meebey meebey net>
Date:   Wed Jan 27 00:13:38 2021 +0800

    Frontend-GNOME: fix method not found exception on Win32

 src/Frontend-GNOME/Frontend-GNOME.csproj |  2 +-
 src/Frontend-GNOME/Views/ChatTreeView.cs | 27 ++++++++++++++++-----------
 2 files changed, 17 insertions(+), 12 deletions(-)
---
diff --git a/src/Frontend-GNOME/Frontend-GNOME.csproj b/src/Frontend-GNOME/Frontend-GNOME.csproj
index 70cf8d6f..52c94be8 100644
--- a/src/Frontend-GNOME/Frontend-GNOME.csproj
+++ b/src/Frontend-GNOME/Frontend-GNOME.csproj
@@ -18,7 +18,7 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>..\..\bin\debug</OutputPath>
-    
<DefineConstants>DEBUG;TRACE;LOG4NET;CONFIG_NINI;GTK_SHARP_2_10;NOTIFY_SHARP;IPC_DBUS;DBUS_SHARP;GTKSPELL</DefineConstants>
+    <DefineConstants>DEBUG;TRACE;LOG4NET;CONFIG_NINI;GTK_SHARP_2_10;;GTKSPELL</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <CheckForOverflowUnderflow>true</CheckForOverflowUnderflow>
diff --git a/src/Frontend-GNOME/Views/ChatTreeView.cs b/src/Frontend-GNOME/Views/ChatTreeView.cs
index 2e87e371..1a0ac9c4 100644
--- a/src/Frontend-GNOME/Views/ChatTreeView.cs
+++ b/src/Frontend-GNOME/Views/ChatTreeView.cs
@@ -48,12 +48,11 @@ namespace Smuxi.Frontend.Gnome
                         return;
                     }
                 } else {
-                    iter = FindChatIter(value);
-                    if (Gtk.TreeIter.Zero.Equals(iter)) {
+                    if (!TryFindChatIter(value, out iter)) {
 #if LOG4NET
                         f_Logger.ErrorFormat(
-                            "set_CurrentChatView(): FindChatIter({0}) " +
-                            "returned Gtk.TreeIter.Zero, ignoring...", value
+                            "set_CurrentChatView(): TryFindChatIter({0}) " +
+                            "found no matching chat, ignoring...", value
                         );
 #endif
                         return;
@@ -171,7 +170,8 @@ namespace Smuxi.Frontend.Gnome
                 throw new ArgumentNullException("chatView");
             }
 
-            var iter = FindChatIter(chatView);
+            Gtk.TreeIter iter;
+            TryFindChatIter(chatView, out iter);
             if (!TreeStore.IterIsValid(iter)) {
                 return;
             }
@@ -186,7 +186,8 @@ namespace Smuxi.Frontend.Gnome
                 throw new ArgumentNullException("chatView");
             }
 
-            var iter = FindChatIter(chatView);
+            Gtk.TreeIter iter;
+            TryFindChatIter(chatView, out iter);
             //var path = TreeStore.GetPath(iter);
             //TreeStore.EmitRowChanged(path, iter);
             // HACK: this emits row_changed _and_ sort_iter_changed and there is
@@ -205,7 +206,8 @@ namespace Smuxi.Frontend.Gnome
             if (!GetVisibleRange(out visibleStart, out visibleEnd)) {
                 return false;
             }
-            var chatIter = FindChatIter(chatView);
+            Gtk.TreeIter chatIter;
+            TryFindChatIter(chatView, out chatIter);
             var chatPath = TreeStore.GetPath(chatIter);
             // we ignore 0 on purpose, say if a few pixels of a row are returned
             // as visible by GetVisibleRange() that is not good enough for us
@@ -463,18 +465,21 @@ namespace Smuxi.Frontend.Gnome
             return parentIter;
         }
 
-        Gtk.TreeIter FindChatIter(ChatView view)
+        bool TryFindChatIter(ChatView view, out Gtk.TreeIter chatIter)
         {
-            Gtk.TreeIter chatIter = Gtk.TreeIter.Zero;
+                       var found = false;
+                       var foundIter = Gtk.TreeIter.Zero;
             TreeStore.Foreach((model, path, iter) => {
                 var candidate = (ChatView) model.GetValue(iter, 0);
                 if (candidate == view) {
-                    chatIter = iter;
+                    foundIter = iter;
+                    found = true;
                     return true;
                 }
                 return false;
             });
-            return chatIter;
+            chatIter = foundIter;
+            return found;
         }
 
         int GetRowNumber(Gtk.TreePath path)