TL;DR: I would like to be able to specify the lack of a tag to check a 
checkbox widget i.e. <$checkbox !tag="incomplete"> 

I had a couple of helper tiddlers and buttons for generating task lists by 
topic. They were

*GenericTaskListComplete*
<$list 
filter="[!has[draft.of]tag{!!title}tag[task]tag[complete]sort[created]]">
<$checkbox tag="complete"><$link to={{!!title}}><$view 
field="title"/></$link></$checkbox><br/>
</$list>


*GenericTaskListIncomplete*
<$list 
filter="[!has[draft.of]tag{!!title}tag[task]!tag[complete]sort[created]]">
<$checkbox tag="complete"> <$link to={{!!title}}><$view 
field="title"/></$link></$checkbox><br/>
</$list>


*Articles (*for example)

!Read Me
{{||GenericTaskListIncomplete}}
!Read 
{{||GenericTaskListComplete}}
!Other
{{||GenericList}} //<-- anything that is not tagged as a task

Which was good...Except when I wanted to stop the tiddler from being a task 
and i'd have to remove both the "task" and "complete" tags. Also "complete" 
tags end up littering up my TW. I would rather that incomplete tasks stood 
out and that i only had to remove one tag on completed tasks :)

So I would prefer to do it this way:

If something is tagged as a "task" and "incomplete" it should be unchecked 
and once completed the "incomplete" tag removed and have it checked. this 
is mostly possible aside from the checked boxes being inverted.

*GenericTaskListComplete*
<$list 
filter="[!has[draft.of]tag{!!title}tag[task]!tag[incomplete]sort[created]]">
<$checkbox tag="incomplete"><$link to={{!!title}}><$view 
field="title"/></$link></$checkbox><br/>
</$list>


*GenericTaskListIncomplete*
<$list 
filter="[!has[draft.of]tag{!!title}tag[task]tag[incomplete]sort[created]]">
<$checkbox tag="incomplete"> <$link to={{!!title}}><$view 
field="title"/></$link></$checkbox><br/>
</$list>

Obviously i could just make a checkbox1 widget and maintain that, but would 
there be any possibility of getting something like a "tag doesn't contain" 
parameter into the checkbox core? In fact a simple "invert=`true`" param 
would be even easier.

Thanks,

James

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