[gnome-builder] buffer: add helpers to avoid stomping on cursor placement

[Christian Hergert <chergert src gnome org>]

commit 866d28e41e6efec7fb7738dd1c7365a91e2a09bb
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jun 30 17:30:09 2017 -0700

    buffer: add helpers to avoid stomping on cursor placement
    
    This can be useful so that we don't restore the cursor mark
    after something has internally tried to set it.

 libide/buffers/ide-buffer-manager.c |   11 +++++++----
 libide/buffers/ide-buffer.c         |   17 +++++++++++++++++
 libide/ide-internal.h               |    2 ++
 3 files changed, 26 insertions(+), 4 deletions(-)
---
diff --git a/libide/buffers/ide-buffer-manager.c b/libide/buffers/ide-buffer-manager.c
index 8a154a7..0d14d96 100644
--- a/libide/buffers/ide-buffer-manager.c
+++ b/libide/buffers/ide-buffer-manager.c
@@ -602,10 +602,13 @@ ide_buffer_manager_load_file__load_cb (GObject      *object,
   else
     gtk_text_buffer_get_start_iter (GTK_TEXT_BUFFER (state->buffer), &iter);
 
-  IDE_TRACE_MSG ("Restoring insert mark to %u:%u",
-                 gtk_text_iter_get_line (&iter) + 1,
-                 gtk_text_iter_get_line_offset (&iter) + 1);
-  gtk_text_buffer_select_range (GTK_TEXT_BUFFER (state->buffer), &iter, &iter);
+  if (_ide_buffer_can_restore_cursor (state->buffer))
+    {
+      IDE_TRACE_MSG ("Restoring insert mark to %u:%u",
+                     gtk_text_iter_get_line (&iter) + 1,
+                     gtk_text_iter_get_line_offset (&iter) + 1);
+      gtk_text_buffer_select_range (GTK_TEXT_BUFFER (state->buffer), &iter, &iter);
+    }
 
   /*
    * Try to discover the content type more accurately now that we have access to the
diff --git a/libide/buffers/ide-buffer.c b/libide/buffers/ide-buffer.c
index a96e1cf..d0592f9 100644
--- a/libide/buffers/ide-buffer.c
+++ b/libide/buffers/ide-buffer.c
@@ -100,6 +100,7 @@ typedef struct
 
   gsize                   change_count;
 
+  guint                   cancel_cursor_restore : 1;
   guint                   changed_on_volume : 1;
   guint                   highlight_diagnostics : 1;
   guint                   loading : 1;
@@ -2937,3 +2938,19 @@ ide_buffer_format_selection_finish (IdeBuffer     *self,
 
   IDE_RETURN (ret);
 }
+
+void
+_ide_buffer_cancel_cursor_restore (IdeBuffer *self)
+{
+  IdeBufferPrivate *priv = ide_buffer_get_instance_private (self);
+  g_return_if_fail (IDE_IS_BUFFER (self));
+  priv->cancel_cursor_restore = TRUE;
+}
+
+gboolean
+_ide_buffer_can_restore_cursor (IdeBuffer *self)
+{
+  IdeBufferPrivate *priv = ide_buffer_get_instance_private (self);
+  g_return_val_if_fail (IDE_IS_BUFFER (self), FALSE);
+  return !priv->cancel_cursor_restore;
+}
diff --git a/libide/ide-internal.h b/libide/ide-internal.h
index 6dd1705..e2b991e 100644
--- a/libide/ide-internal.h
+++ b/libide/ide-internal.h
@@ -40,6 +40,8 @@ void                _ide_buffer_set_changed_on_volume       (IdeBuffer
 gboolean            _ide_buffer_get_loading                 (IdeBuffer             *self);
 void                _ide_buffer_set_loading                 (IdeBuffer             *self,
                                                              gboolean               loading);
+void                _ide_buffer_cancel_cursor_restore       (IdeBuffer             *self);
+gboolean            _ide_buffer_can_restore_cursor          (IdeBuffer             *self);
 void                _ide_buffer_set_mtime                   (IdeBuffer             *self,
                                                              const GTimeVal        *mtime);
 void                _ide_buffer_set_read_only               (IdeBuffer             *buffer,