Auto-orient images when determining dimensions

libvips and image magick handle image orientation correctly when
creating thumbnails. Paperclip only parses the orientation header, but
does not automatically apply when parsing geometry.

Storing dimensions in the wrong orientation causes inline images to
have an incorrect aspect ratio.

REDMINE-20746

app/models/pageflow/image_file.rb

@@ -81,6 +81,8 @@ def self.scale_down_to_cover(width, height)
 
     def save_image_dimensions
       geo = Paperclip::Geometry.from_file(attachment.queued_for_write[:original])
+      geo.auto_orient
+
       self.width = geo.width
       self.height = geo.height
     rescue Paperclip::Errors::NotIdentifiedByImageMagickError

spec/state_machines/pageflow/image_and_text_track_processing_state_machine_spec.rb

@@ -37,6 +37,15 @@ module Pageflow
           expect(file.reload.height).to eq(15)
         end
 
+        it 'auto orients image when saving width and heigh' do
+          file = create(:image_file, :uploaded, file_name: '7x15_rotated.jpg')
+
+          file.process
+
+          expect(file.reload.width).to eq(15)
+          expect(file.reload.height).to eq(7)
+        end
+
         it 'sets width and height to nil if image cannot be identified' do
           file = create(:image_file, :uploaded, file_name: 'broken.jpg')