Implement strike-through support for wxDataViewCtrl in wxGTK too

Previously it was supported in the generic version only, see #18180 and
the changes of 09124932eb

Closes https://github.com/wxWidgets/wxWidgets/pull/892

docs/changes.txt

@@ -110,7 +110,7 @@ All (GUI):
 - Fix possible infinite loop in wxHtmlWindow layout (trivia21).
 - Add "hint" property support to XRC for wxComboBox and wxSearchCtrl.
 - Add support for style="page-break-inside:avoid" to <div> in wxHTML.
-- Add strike-through support to wxDataViewItem attributes (approach).
+- Support strike-through in wxDataViewItem attributes (approach, Igor Korot).
 
 wxGTK:
 

interface/wx/dataview.h

@@ -718,7 +718,7 @@ public:
         text.
 
         Currently this attribute is only supported in the generic version of
-        wxDataViewCtrl and ignored by the native GTK+ and OS X implementations.
+        wxDataViewCtrl and GTK and ignored by the native OS X implementations.
 
         @since 3.1.2
     */

src/gtk/dataview.cpp

@@ -2275,6 +2275,23 @@ void GtkApplyAttr(GtkCellRendererText *renderer, const wxDataViewItemAttr& attr)
         g_value_unset( &gvalue );
     }
 
+    if (attr.GetStrikethrough())
+    {
+        GValue gvalue = G_VALUE_INIT;
+        g_value_init( &gvalue, G_TYPE_BOOLEAN );
+        g_value_set_boolean( &gvalue, TRUE );
+        g_object_set_property( G_OBJECT(renderer), "strikethrough", &gvalue );
+        g_value_unset( &gvalue );
+    }
+    else
+    {
+        GValue gvalue = G_VALUE_INIT;
+        g_value_init( &gvalue, G_TYPE_BOOLEAN );
+        g_value_set_boolean( &gvalue, FALSE );
+        g_object_set_property( G_OBJECT(renderer), "strikethrough-set", &gvalue );
+        g_value_unset( &gvalue );
+    }
+
     if (attr.HasBackgroundColour())
     {
         GValue gvalue = G_VALUE_INIT;