[regexxer] Fix build with recent glibmm releases

[Daniel Elstner <daniel src gnome org>]

commit a78ad731fd79f646f1e0ffa7fbf370bbff5c76ac
Author: Daniel Elstner <danielk openismus com>
Date:   Wed Jun 24 20:09:58 2009 +0200

    Fix build with recent glibmm releases
    
    * src/filebuffer.cc (FileBuffer::on_mark_deleted): Use swap() to
    reset Glib::RefPtr<> because neither clear() nor reset() can be
    relied upon to be there.
    * src/filetree.cc (FileTree::save_file_at_iter): ditto,
    (FileTree::find_matches_at_path_iter): ditto,
    (FileTree::on_selection_changed): ditto.

 src/filebuffer.cc |    4 ++--
 src/filetree.cc   |    6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/src/filebuffer.cc b/src/filebuffer.cc
index 5699ca7..2f4642e 100644
--- a/src/filebuffer.cc
+++ b/src/filebuffer.cc
@@ -679,7 +679,7 @@ void FileBuffer::on_mark_deleted(const Glib::RefPtr<FileBuffer::Mark>& mark)
   {
     const MatchSet::iterator pos = current_match_++;
 
-    (*pos)->mark.clear();
+    Glib::RefPtr<FileBuffer::Mark>().swap((*pos)->mark);
     match_set_.erase(pos);
     match_removed_ = true;
 
@@ -693,7 +693,7 @@ void FileBuffer::on_mark_deleted(const Glib::RefPtr<FileBuffer::Mark>& mark)
 
     if (pos != match_set_.end())
     {
-      (*pos)->mark.clear();
+      Glib::RefPtr<FileBuffer::Mark>().swap((*pos)->mark);
       match_set_.erase(pos);
 
       --match_count_;
diff --git a/src/filetree.cc b/src/filetree.cc
index c0b2cbe..3fc2398 100644
--- a/src/filetree.cc
+++ b/src/filetree.cc
@@ -536,7 +536,7 @@ bool FileTree::save_file_at_iter(const Gtk::TreeModel::iterator& iter,
       propagate_modified_change(iter, false);
 
     if (fileinfo != last_selected_ && fileinfo->buffer->is_freeable())
-      fileinfo->buffer.clear(); // reduce memory footprint
+      Glib::RefPtr<FileBuffer>().swap(fileinfo->buffer); // reduce memory footprint
   }
 
   return false;
@@ -588,7 +588,7 @@ bool FileTree::find_matches_at_path_iter(const Gtk::TreeModel::Path& path,
       propagate_match_count_change(iter, new_match_count - old_match_count);
 
     if (fileinfo != last_selected_ && buffer->is_freeable())
-      fileinfo->buffer.clear(); // reduce memory footprint
+      Glib::RefPtr<FileBuffer>().swap(fileinfo->buffer); // reduce memory footprint
   }
 
   return false;
@@ -736,7 +736,7 @@ void FileTree::on_selection_changed()
   if (last_selected_ && last_selected_ != fileinfo &&
       last_selected_->buffer && last_selected_->buffer->is_freeable())
   {
-    last_selected_->buffer.clear(); // reduce memory footprint
+    Glib::RefPtr<FileBuffer>().swap(last_selected_->buffer); // reduce memory footprint
   }
 
   last_selected_ = fileinfo;