use the update mechanism to reset images instead of deleting them (leading to a time advantage when the image did not change)

openlp/core/lib/imagemanager.py

@@ -286,15 +286,6 @@ class ImageManager(QtCore.QObject):
                 time.sleep(0.1)
         return image.image_bytes
 
-    def deleteImage(self, name):
-        """
-        Delete the Image from the cache.
-        """
-        log.debug(u'deleteImage %s' % name)
-        if name in self._cache:
-            self._conversionQueue.remove(self._cache[name])
-            del self._cache[name]
-
     def addImage(self, name, path, source, background):
         """
         Add image to cache if it is not already there.

openlp/core/lib/renderer.py

@@ -134,6 +134,7 @@ class Renderer(object):
         else:
             theme_data, main_rect, footer_rect = \
                 self._theme_dimensions[theme_name]
+        #FIXME: REMOVE deleteImage() call which will be added soon.
         # if No file do not update cache
         if theme_data.background_filename:
             self.image_manager.addImage(theme_data.theme_name,
@@ -236,7 +237,6 @@ class Renderer(object):
             # make big page for theme edit dialog to get line count
             serviceItem.add_from_text(VERSE_FOR_LINE_COUNT)
         else:
-            self.image_manager.deleteImage(theme_data.theme_name)
             serviceItem.add_from_text(VERSE)
         serviceItem.renderer = self
         serviceItem.raw_footer = FOOTER