[gthumb] update the image quality only if the image is still visibile

[Paolo Bacchilega <paobac src gnome org>]

commit 4be5ac02d274c9945e81be299454a3e9055c89cd
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Jan 5 11:04:18 2019 +0100

    update the image quality only if the image is still visibile

 extensions/image_viewer/gth-image-viewer-page.c | 34 ++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)
---
diff --git a/extensions/image_viewer/gth-image-viewer-page.c b/extensions/image_viewer/gth-image-viewer-page.c
index f7714d82..22049900 100644
--- a/extensions/image_viewer/gth-image-viewer-page.c
+++ b/extensions/image_viewer/gth-image-viewer-page.c
@@ -261,7 +261,7 @@ profile_ready_cb (GObject      *source_object,
        ProfileData        *profile_data = user_data;
        GthImageViewerPage *self = profile_data->self;
 
-       if (self->priv->active) {
+       if (self->priv->active && ! self->priv->image_changed && _g_file_equal (self->priv->file_data->file, 
profile_data->file_data->file)) {
                GthICCProfile *profile;
 
                profile = gth_color_manager_get_profile_finish (GTH_COLOR_MANAGER (source_object), res, NULL);
@@ -429,16 +429,38 @@ _g_mime_type_can_load_different_quality (const char *mime_type)
 }
 
 
+typedef struct {
+       GthImageViewerPage *self;
+       GthFileData *file_data;
+} UpdateQualityData;
+
+
+static void
+update_quality_data_free (UpdateQualityData *data)
+{
+       _g_object_unref (data->file_data);
+       g_free (data);
+}
+
+
 static gboolean
 update_quality_cb (gpointer user_data)
 {
-       GthImageViewerPage *self = user_data;
+       UpdateQualityData  *data = user_data;
+       GthImageViewerPage *self = data->self;
+       gboolean            file_changed;
 
        if (self->priv->update_quality_id != 0) {
                g_source_remove (self->priv->update_quality_id);
                self->priv->update_quality_id = 0;
        }
 
+       file_changed = ! _g_file_equal_uris (data->file_data->file, self->priv->file_data->file);
+       update_quality_data_free (data);
+
+       if (file_changed)
+               return FALSE;
+
        if (! self->priv->active)
                return FALSE;
 
@@ -480,9 +502,15 @@ update_image_quality_if_required (GthImageViewerPage *self)
                self->priv->update_quality_id = 0;
        }
 
+       UpdateQualityData *data;
+
+       data = g_new0 (UpdateQualityData, 1);
+       data->self = self;
+       data->file_data = _g_object_ref (self->priv->file_data);
+
        self->priv->update_quality_id = g_timeout_add (UPDATE_QUALITY_DELAY,
                                                       update_quality_cb,
-                                                      self);
+                                                      data);
 #endif
 }