[gnote] Do not overwrite entire note when replacing title

[Aurimas Černius <aurimasc src gnome org>]

commit 6ddd84772582a23bad13c64cfbc361cf831e3caa
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Thu Jun 20 18:47:42 2013 +0300

    Do not overwrite entire note when replacing title
    
    Overwriting entire note affects undo - it causes first undo to delete
    entire note and a second one to restore the previous one. After this fix
    the effect is the same, but only for title, the rest is not affected.
    Fixes Bug 701616.

 src/addins/replacetitle/replacetitlenoteaddin.cpp |   22 ++++++++++----------
 1 files changed, 11 insertions(+), 11 deletions(-)
---
diff --git a/src/addins/replacetitle/replacetitlenoteaddin.cpp 
b/src/addins/replacetitle/replacetitlenoteaddin.cpp
index 9908987..01101fb 100644
--- a/src/addins/replacetitle/replacetitlenoteaddin.cpp
+++ b/src/addins/replacetitle/replacetitlenoteaddin.cpp
@@ -84,20 +84,20 @@ void ReplaceTitleNoteAddin::replacetitle_button_clicked()
   Glib::RefPtr<Gtk::Clipboard> refClipboard = Gtk::Clipboard::get(GDK_SELECTION_PRIMARY);
   const std::string newTitle= refClipboard->wait_for_text();
   Glib::RefPtr<Gtk::TextBuffer> buffer = get_note()->get_buffer();
-  Gtk::TextIter iter = buffer->get_insert()->get_iter();
-  int line = iter.get_line();
-  int line_offset = iter.get_line_offset();
 
   // replace note content
   if(!newTitle.empty()) {
-    std::string new_content(get_note()->xml_content());
-    get_note()->set_xml_content(sharp::string_replace_first(new_content, get_note()->get_title(), newTitle));
-    if(line) {
-      iter = buffer->get_insert()->get_iter();
-      iter.set_line(line);
-      iter.set_line_offset(line_offset);
-      buffer->place_cursor(iter);
-    }
+    Gtk::TextIter title_start = buffer->get_iter_at_offset(0);
+    Gtk::TextIter title_end = title_start;
+    title_end.forward_to_line_end();
+    buffer->erase(title_start, title_end);
+    buffer->insert(buffer->get_iter_at_offset(0), newTitle);
+    title_end = title_start = buffer->get_iter_at_offset(0);
+    title_end.forward_to_line_end();
+    Glib::RefPtr<Gtk::TextTag> title_tag = buffer->get_tag_table()->lookup("note-title");
+    buffer->apply_tag(title_tag, title_start, title_end);
+    // in case the text was multile, new title is only the first line
+    get_note()->set_title(title_start.get_text(title_end));
   }
 }