Can accidentally open same WiddlyWiki in two different tabs

[MarkStevans]

These can collide and overwrite changes.

[buggyj]

I am not sure if I will try to fix this. I pin my tiddlywikis to make this less likely. There was a addon that used to indicate when a url was open more than once...

[MarkStevans]

Worth maybe a release note caveat.

[pmario]

@buggyj ... I'm about to implement a check for this problem. ... When finished I'll link to the code.

[pmario]

I did use this code as a basis: https://github.com/TiddlyWiki/TiddlyFox/blob/master/data/tab-content.js#L108-L124 .... I changed some elements to x.innerHTML = ... ... which give me some warnings in the mozilla store now. ... So I'll need to revert back to be more like this code.