remove image from sidebar if deleted from image popup toolbar

[cspencer905]

on right side panel when trying to delete an image i was redirected to a new page that doesn't exist
when i delete it from the floating editing panel when the image is selected it no longer appears on the map but it is still there

[jywarren]

I noticed this; I think it wouldn't be a tough fix but we have a bit of a long list at the moment :-(

I'm hoping we can recruit more contributors soon; please pass on the word if you know any developers looking to help out on an open source project!

[mathewlippincott]

Another case of this is I delete it from the map but it stays in the "images" menu but without the ability to re-place it on the map.

[mathewlippincott]

images no longer appear on the map but all reappear when the map is reloaded

[jywarren]

2 issues; we should show an error when you're not logged in (covered in #118) and want to delete, and should remove image from sidebar if deleted from image popup toolbar.

[jywarren]

This is actually a bit more complex; the 'delete' listener we're using is fired after the image is deleted from the client-side Leaflet environment. I just wrote code that "confirms" with a popup, sends a "delete" command to the server, and then removes the image from the sidebar, but by the time that fires, it's already been removed from the local instance -- though it'll show up again if the page is reloaded. We have to override the native "delete" behavior of Leaflet.DistortableImage to not actually delete, but to defer to the handler we've provided for the "delete" event.

[jywarren]

OK, this is partially complete in my local branch; now we need to ensure that the uploader adds a "warpable-#" id to newly uploaded images' sidebar elements, so this works for newly uploaded images too.

[numeroteca]

More on this behaviour:
When an image is deleted it disappears from the sidebar. The top status check mark changes to red.
When the page is reloaded the image re-appears placed in the map. The top status check mark changes to green.
Map: http://mapknitter.org/maps/placa-salvador-segui-barcelona#