[gnome-builder] sourceview: check IdeSourceView cast

[Christian Hergert <chergert src gnome org>]

commit bfbc2f07821ceb352f95669ff40c644bf0cfb9eb
Author: Christian Hergert <chergert redhat com>
Date:   Sun Aug 4 12:14:10 2019 -0700

    sourceview: check IdeSourceView cast

 src/libide/sourceview/ide-completion.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/libide/sourceview/ide-completion.c b/src/libide/sourceview/ide-completion.c
index bba99a056..986bd4be2 100644
--- a/src/libide/sourceview/ide-completion.c
+++ b/src/libide/sourceview/ide-completion.c
@@ -188,7 +188,7 @@ ide_completion_is_blocked (IdeCompletion *self)
          !gtk_widget_has_focus (GTK_WIDGET (self->view)) ||
          !(buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (self->view))) ||
          gtk_text_buffer_get_has_selection (buffer) ||
-         !GTK_SOURCE_IS_VIEW (self->view) ||
+         !IDE_IS_SOURCE_VIEW (self->view) ||
          _ide_source_view_has_cursors (IDE_SOURCE_VIEW (self->view)) ||
          !ide_source_view_is_processing_key (IDE_SOURCE_VIEW (self->view));
 }