don't return the next line text from GetLineText() for empty lines (patch 1697208) [backport from HEAD]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@45362 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -111,6 +111,7 @@ wxGTK:
 
 - Fix infinite loop when adding a wxStaticText control to a toolbar
 - Fix wxNO_BORDER style for wxRadioBox (David Hart)
+- Fix wxTextCtrl::GetLineText() for empty lines (Marcin Wojdyr)
 
 
 2.8.3

src/gtk/textctrl.cpp

@@ -1119,8 +1119,12 @@ wxString wxTextCtrl::GetLineText( long lineNo ) const
     {
         GtkTextIter line;
         gtk_text_buffer_get_iter_at_line(m_buffer,&line,lineNo);
+
         GtkTextIter end = line;
-        gtk_text_iter_forward_to_line_end(&end);
+        // avoid skipping to the next line end if this one is empty
+        if ( !gtk_text_iter_ends_line(&line) )
+            gtk_text_iter_forward_to_line_end(&end);
+
         wxGtkString text(gtk_text_buffer_get_text(m_buffer, &line, &end, true));
         result = wxGTK_CONV_BACK(text);
     }