Hi Felix,
I think a widget doesn't know, if it is in preview mode, because preview
mode is nothing special. It's a button with a reveal widget.
I did a short test:
<$edit tiddler="xx"> ... which produces the textarea
creates this DOM:
<div class="tc-tiddler-preview-preview">
<p>
<textarea style="height: 100px;">Type the text for the tiddler
'xx'</textarea>
</p>
</div>
-m
So imo you need to walk up 2 parent nodes, and check for class
tc-tiddler-preview-preview. The mechanism is a bit fragile, because it
depends on the class, but imo it won't change any time soon.
-m
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