allow remove_image to be cancelled

lib/carrierwave/mounter.rb

@@ -168,7 +168,7 @@ def blank?
 
     def remove=(value)
       @remove = value
-      write_temporary_identifier if remove?
+      write_temporary_identifier
     end
 
     def remove?

lib/carrierwave/uploader/store.rb

@@ -87,7 +87,7 @@ def store!(new_file=nil)
             end
             @file = new_file
             @identifier = storage.identifier
-            @cache_id = @deduplication_index = nil
+            @original_filename = @cache_id = @deduplication_index = nil
             @staged = false
           end
         end

spec/orm/activerecord_spec.rb

@@ -426,6 +426,17 @@ def monkey
         expect(@event.image_identifier).to eq(nil)
       end
 
+      it "should cancel removing image if remove_image is switched to false" do
+        @event.image = stub_file('test.jpeg')
+        @event.save!
+        @event.remove_image = true
+        @event.remove_image = false
+        @event.save!
+        @event.reload
+        expect(@event[:image]).to eq('test.jpeg')
+        expect(@event.image_identifier).to eq('test.jpeg')
+      end
+
       it "should mark image as changed when saving a new image" do
         expect(@event.image_changed?).to be_falsey
         @event.image = stub_file("test.jpeg")
@@ -1394,6 +1405,17 @@ def monkey
         expect(@event.images_identifiers[0]).to eq(nil)
       end
 
+      it "should cancel removing images if remove_images is switched to false" do
+        @event.images = [stub_file('test.jpeg')]
+        @event.save!
+        @event.remove_images = true
+        @event.remove_images = false
+        @event.save!
+        @event.reload
+        expect(@event[:images]).to eq(['test.jpeg'])
+        expect(@event.images_identifiers[0]).to eq('test.jpeg')
+      end
+
       it "should mark images as changed when saving a new images" do
         expect(@event.images_changed?).to be_falsey
         @event.images = [stub_file("test.jpeg")]