Use server load/save endpoints from front end

[reddigari]

• Load/save on front-end hits endpoints @reelmatt set up #27
  • Save sends the diagram data, receives the response containing the diagram and backend serializations, and begins a download
  • Load prompts user for file upload, sends to server, receives response, and deserializes/renders diagram
• Workspace occupies full width of screen

[reddigari]

@reelmatt Hmmm I can't seem to replicate it. Can you take a screen recording?

[reelmatt]

Slightly different behavior then what I was experiencing earlier. I can get it to clear and load (unlike before), but a second clear seems to cause a problem? My thinking was it was whatever 'clear' was doing, but that doesn't seem to be the case.

Original screen recording

Edit: I think I may have found the actual problem. It's not with the clearing as I original though, but re-loading the same diagram back in. General steps to reproduce seem to be:

1. Load diagram 1
2. Clear
3. Load diagram 1 (fails)
4. Load diagram 2 (succeeds)
5. Clear
6. Load diagram 2 (fails)

New screen recording

[reddigari]

Excellent catch. The event listener is for onchange, so if you select the same file, the listener doesn't fire. I'll fix it to reset the file between each event.