[gnome-builder] vim: only retract offset if we aren't at the begining of the line

[Christian Hergert <chergert src gnome org>]

commit 35a61c6d926eaa4fc2afca6f20f43b58b83cd022
Author: Christian Hergert <christian hergert me>
Date:   Wed Dec 31 03:22:31 2014 -0800

    vim: only retract offset if we aren't at the begining of the line

 src/vim/gb-source-vim.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/src/vim/gb-source-vim.c b/src/vim/gb-source-vim.c
index 7e7f2ce..6338aac 100644
--- a/src/vim/gb-source-vim.c
+++ b/src/vim/gb-source-vim.c
@@ -1545,7 +1545,11 @@ gb_source_vim_move_up (GbSourceVim *vim)
   if (is_single_char_selection (&iter, &selection))
     {
       if (gtk_text_iter_compare (&iter, &selection) > 0)
-        priv->target_line_offset = --offset;
+        {
+          if (offset)
+            --offset;
+          priv->target_line_offset = offset;
+        }
     }
 
   gtk_text_buffer_get_iter_at_line (buffer, &iter, line - 1);