[gnome-builder/gnome-builder-3-28] buffers: backport highlight disable while loading

[Christian Hergert <chergert src gnome org>]

commit 14380d0362bd92a68884c831d6316a87f790cd4e
Author: Christian Hergert <chergert redhat com>
Date:   Thu Aug 2 10:51:41 2018 -0700

    buffers: backport highlight disable while loading
    
    This disables highlighting while we load the buffer to avoid some work
    and potential races in gtksourceview.

 src/libide/buffers/ide-buffer-manager.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/libide/buffers/ide-buffer-manager.c b/src/libide/buffers/ide-buffer-manager.c
index 3e7fe2594..52ae571dd 100644
--- a/src/libide/buffers/ide-buffer-manager.c
+++ b/src/libide/buffers/ide-buffer-manager.c
@@ -78,6 +78,7 @@ typedef struct
   IdeProgress          *progress;
   GtkSourceFileLoader  *loader;
   guint                 is_new : 1;
+  guint                 rehighlight : 1;
   IdeWorkbenchOpenFlags flags;
   guint                 line;
   guint                 line_offset;
@@ -609,6 +610,8 @@ 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);
+
   if (state->is_new)
     ide_buffer_manager_track_buffer (self, state->buffer);
 
@@ -743,6 +746,9 @@ ide_buffer_manager__load_file_query_info_cb (GObject      *object,
 
   cancellable = g_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,