Webapp : Prevent the concurrent edition of task.yaml from the GUI

[vvandenschrieck]

Task edition in different browser tabs is problematic - You can't edit the basic settings and subproblems in parallel a as changes made in one tab will override changes in the other (which is logical given that both information are in the same file).

[layus]

GitHub uses websockets to detect multiple tabs from the same user/browser. This could be used to implement a simple locking mechanism, or preventing multiple editor tabs.

[GuillaumeDerval]

For now, websockets are not available in both lighttpd (https://redmine.lighttpd.net/boards/3/topics/4782) and web.py.

What we can do is to check periodically if the original file changed, and to force a refresh, discarding changes that are "now outdated".

[GuillaumeDerval]

What we could do is to check which are the field that changed, and update only those fields

[ogoletti]

Even though, this is only a partial solution. A warning could be nice when editing the same field. And this also occur when editing different files ! For example : A edits the run file, at the same moment B edits the context (ie, the task.yaml). => the last one to save will override the other modifications