[gthumb] Fixed crash when browsing folder with images and videos

[Paolo Bacchilega <paobac src gnome org>]

commit b2c60b193574b8210c1341cc1733a536ec607be4
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Feb 7 18:06:13 2018 +0100

    Fixed crash when browsing folder with images and videos
    
    Check whether the viewer is still active after getting
    the color profile.
    
    [bug #760214]

 extensions/image_viewer/gth-image-viewer-page.c |   32 ++++++++++++++--------
 1 files changed, 20 insertions(+), 12 deletions(-)
---
diff --git a/extensions/image_viewer/gth-image-viewer-page.c b/extensions/image_viewer/gth-image-viewer-page.c
index ddeb35d..17b61b4 100644
--- a/extensions/image_viewer/gth-image-viewer-page.c
+++ b/extensions/image_viewer/gth-image-viewer-page.c
@@ -259,22 +259,27 @@ profile_ready_cb (GObject      *source_object,
 {
        ProfileData        *profile_data = user_data;
        GthImageViewerPage *self = profile_data->self;
-       GthICCProfile      *profile;
 
-       profile = gth_color_manager_get_profile_finish (GTH_COLOR_MANAGER (source_object), res, NULL);
-       if (profile == NULL)
-               profile = _g_object_ref (gth_browser_get_monitor_profile (self->priv->browser));
-       gth_image_preloader_set_out_profile (self->priv->preloader, profile);
+       if (self->priv->active) {
+               GthICCProfile *profile;
+
+               profile = gth_color_manager_get_profile_finish (GTH_COLOR_MANAGER (source_object), res, NULL);
+               if (profile == NULL)
+                       profile = _g_object_ref (gth_browser_get_monitor_profile (self->priv->browser));
+               gth_image_preloader_set_out_profile (self->priv->preloader, profile);
 
-       _gth_image_viewer_page_load_with_preloader_step2 (profile_data->self,
-                                                         profile_data->file_data,
-                                                         profile_data->requested_size,
-                                                         profile_data->cancellable,
-                                                         profile_data->callback,
-                                                         profile_data->user_data);
+               _gth_image_viewer_page_load_with_preloader_step2 (profile_data->self,
+                                                                 profile_data->file_data,
+                                                                 profile_data->requested_size,
+                                                                 profile_data->cancellable,
+                                                                 profile_data->callback,
+                                                                 profile_data->user_data);
+
+               _g_object_unref (profile);
+       }
 
-       _g_object_unref (profile);
        profile_data_free (profile_data);
+       g_object_unref (res);
 }
 
 
@@ -1416,6 +1421,7 @@ gth_image_viewer_page_real_view (GthViewerPage *base,
 
        self = (GthImageViewerPage*) base;
        g_return_if_fail (file_data != NULL);
+       g_return_if_fail (self->priv->active);
 
        gth_viewer_page_focus (GTH_VIEWER_PAGE (self));
 
@@ -2389,6 +2395,8 @@ gth_image_viewer_page_apply_icc_profile   (GthImageViewerPage *self,
 {
        GthFileData *file_data;
 
+       g_return_if_fail (self->priv->active);
+
        self->priv->apply_icc_profile = apply;
        gth_image_preloader_clear_cache (self->priv->preloader);