In my mind, an "undo function" is synonymous with "version control". 

On Thursday, February 28, 2019 at 9:19:10 AM UTC-6, Mohammad wrote:
>
> Yes, an undo function is possible to not overwrite the original tiddlers.
> But I am afraid duplication tiddlers in this way will result in huge file 
> size.
>
> --Mohammad
>
> On Thursday, February 28, 2019 at 6:19:57 PM UTC+3:30, @TiddlyTweeter 
> wrote:
>>
>> Mohammad
>>
>> Really excellent. Its working well and I haven't been able to get it to 
>> fail. It will have huge use I am sure.
>>
>> I do think an issue is UNDO.
>>
>> Let me show why ...
>>
>> On a balmy day SHE took advice that HE needed to walk.
>>
>> If we replace "SHE" with "HE" we get ...
>>
>> On a balmy day HE took advice that HE needed to walk.
>>
>> But it can't easily be reversed  just switching "find" & "replace" terms 
>> as you'd get ...
>>
>> On a balmy day SHE took advice that SHE needed to walk.
>>
>>
>> I think the simplest way to deal with this is that a Tiddler under s-n-r 
>> is cloned to a state tiddler before changes occur that can be RESTORED.
>>
>> What do you think?
>>
>> Best wishes
>> Josiah
>>
>>
>>
>> Could the tiddler/s you working on be 
>>
>> On Thursday, 28 February 2019 07:54:26 UTC+1, Mohammad wrote:
>>>
>>> Announcement: SNR
>>>
>>> This is a simple script, search-n-replcae (*snr*) to search in tiddler 
>>> contents (including all fields) for a searchValue and replace them with 
>>> replaceValue.
>>>
>>> See the original post here!
>>>
>>> https://groups.google.com/d/msg/tiddlywiki/lTYxRbGon1o/V8PVsvt1AgAJ
>>>
>>>
>>> Demo: https://kookma.github.io/search-n-replace/
>>>
>>>
>>> --Mohammad
>>>
>>

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