[gnome-builder] bufmgr: avoid highlighting while loading files

[Christian Hergert <chergert src gnome org>]

commit 0b2d41eb4d9ac7f38f6477f24521448be2c24157
Author: Christian Hergert <chergert redhat com>
Date:   Thu Aug 2 10:21:27 2018 -0700

    bufmgr: avoid highlighting while loading files
    
    This ensures that we don't race against some other components in GSV while
    the underlying buffer is loading.
    
    This works around GNOME/gtksourceview#15

 src/libide/buffers/ide-buffer-manager.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/libide/buffers/ide-buffer-manager.c b/src/libide/buffers/ide-buffer-manager.c
index d27670056..fc969e8ec 100644
--- a/src/libide/buffers/ide-buffer-manager.c
+++ b/src/libide/buffers/ide-buffer-manager.c
@@ -72,6 +72,7 @@ typedef struct
   IdeProgress          *progress;
   GtkSourceFileLoader  *loader;
   guint                 is_new : 1;
+  guint                 rehighlight : 1;
   IdeWorkbenchOpenFlags flags;
   guint                 line;
   guint                 line_offset;
@@ -512,6 +513,9 @@ ide_buffer_manager_load_file__load_cb (GObject      *object,
 
   gtk_text_buffer_set_modified (GTK_TEXT_BUFFER (state->buffer), FALSE);
 
+  gtk_source_buffer_set_highlight_syntax (GTK_SOURCE_BUFFER (state->buffer),
+                                          state->rehighlight);
+
   /* try to restore the insertion cursor */
   if (g_settings_get_boolean (self->settings, "restore-insert-mark"))
     gtk_text_buffer_get_iter_at_line_offset (GTK_TEXT_BUFFER (state->buffer), &iter,
@@ -645,6 +649,9 @@ ide_buffer_manager__load_file_query_info_cb (GObject      *object,
 
   cancellable = ide_task_get_cancellable (task);
 
+  state->rehighlight = gtk_source_buffer_get_highlight_syntax (GTK_SOURCE_BUFFER (state->buffer));
+  gtk_source_buffer_set_highlight_syntax (GTK_SOURCE_BUFFER (state->buffer), FALSE);
+
   gtk_source_file_loader_load_async (state->loader,
                                      G_PRIORITY_LOW,
                                      cancellable,