Stumbled on what seems to be a bug, though I don’t have access to another system to check. To reproduce:
$:/tags/Macro
\define tv-action-refresh-policy() always
After closing / re-opening, I can turn the preview on, but not off.
This is a known behaviour and is one of the reasons it is not recommended to globally set the tv-action-refresh-policy to always.
Ah, I see the warning now in the docs - sorry about that. Thanks for the quick reply.
Note that you can still set action-refresh-policy to always within a global macro without changing the global value of the macro.
Instead of using a define pragma, use a $let widget to set the value of action-refresh-policy.