Thanks for your replies Mario!

Don't use "production" for your experiments, without a backup. 
>

You're of course right.  Hours would have been saved over the years had I 
not needed to "juuust improve that one little minor detail so I couldn't 
possibly need to backup this one time".
 
 

> if there actually is a copy kept of the original, then why can't we let 
>> this copy be updated so that if I delete my modified version then I revert 
>> back but to an updated original.
>>
>  
>
That's the case. 
>

Excellent!

I hadn't realized core was a single plugin and so I thought the reasoning 
was "the user has updated tiddler X so it will not be updated so to not 
have it overwritten." Glad to understand this is not how it works.

----------------------------------------------


BTW, the current warning message merely gives the rather cryptic 
information that "future upgrades will be non-trivial". Maybe the warning 
message inform (or link to) an explanation with something along: 

"If you modify a shadow tiddler, a copy of the original version will be 
kept. Updating your TiddlyWiki will update this original copy but not your 
modified copy. Deleting your modified copy will re-activate the original 
shadow tiddler."

Considering our target user groups, and as indicated by this thread, I 
believe this is of value for a user to know. If he is advanced enough to 
mess with shadow tiddlers, then this is relevant info.

-----------------------------------------------


Another question, from pondering on the above. Are these statements true:

"Default/empty TW =  shadowTiddlers + systemTiddlers", i.e nothing more.

"coreTiddlers = someOfTheShadowTiddlers + someOfTheSystemTiddlers", i.e 
nothing more.

"defaultShadowTiddlers = coreShadowTiddlers + pluginshadowtiddlers", i.e 
nothing more.



Thank you Mario, or whoever is kind to answer.

<:-)

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