[gnome-builder] editor: special case \n insertion for change tracking.

[Christian Hergert <chergert src gnome org>]

commit ba93cccd54fff8a22f5ef552d69bcbf1055a8c3a
Author: Christian Hergert <christian hergert me>
Date:   Mon Sep 15 15:05:19 2014 -0700

    editor: special case \n insertion for change tracking.
    
    Now when you \n at the beginning of the line, we track the insert on the
    correct line.

 src/editor/gb-source-change-monitor.c |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)
---
diff --git a/src/editor/gb-source-change-monitor.c b/src/editor/gb-source-change-monitor.c
index dc43d49..0a595fe 100644
--- a/src/editor/gb-source-change-monitor.c
+++ b/src/editor/gb-source-change-monitor.c
@@ -32,6 +32,9 @@ struct _GbSourceChangeMonitorPrivate
   guint delete_range_after_handler;
   guint insert_text_before_handler;
   guint insert_text_after_handler;
+
+  guint insert_begin_line;
+  guint insert_begin_offset;
 };
 
 enum
@@ -249,12 +252,18 @@ on_insert_text_before_cb (GbSourceChangeMonitor *monitor,
                           gint                   len,
                           GtkTextBuffer         *buffer)
 {
+  GbSourceChangeMonitorPrivate *priv;
   GtkTextIter begin;
   GtkTextIter end;
 
   g_return_if_fail (GB_IS_SOURCE_CHANGE_MONITOR (monitor));
   g_return_if_fail (GTK_IS_TEXT_BUFFER (buffer));
 
+  priv = monitor->priv;
+
+  priv->insert_begin_line = gtk_text_iter_get_line (location);
+  priv->insert_begin_offset = gtk_text_iter_get_line_offset (location);
+
   gtk_text_buffer_get_bounds (buffer, &begin, &end);
 
   /*
@@ -277,18 +286,24 @@ on_insert_text_after_cb (GbSourceChangeMonitor *monitor,
                          gint                   len,
                          GtkTextBuffer         *buffer)
 {
+  GbSourceChangeMonitorPrivate *priv;
   GbSourceChangeFlags flags = 0;
   guint line;
 
   g_return_if_fail (GB_IS_SOURCE_CHANGE_MONITOR (monitor));
   g_return_if_fail (GTK_IS_TEXT_BUFFER (buffer));
 
+  priv = monitor->priv;
+
   line = gtk_text_iter_get_line (location);
 
   if (g_strcmp0 (text, "\n") == 0)
     {
       flags = (GB_SOURCE_CHANGE_ADDED | GB_SOURCE_CHANGE_DIRTY);
-      gb_source_change_monitor_insert (monitor, line, flags);
+      if (priv->insert_begin_offset == 0)
+        gb_source_change_monitor_insert (monitor, line-1, flags);
+      else
+        gb_source_change_monitor_insert (monitor, line, flags);
     }
   else if (strchr (text, '\n') == NULL)
     {