Temporary lines for filling border?

[PixLab]

(06-18-2021, 07:55 AM)snowforest Wrote: Is it possible to make temporary lines to serve as a border for filling, and then when we are finished with the filling, we delete these lines? Or what do you suggest?

Indeed you can make "temporary lines" using a new layer, then when you fill with the bucket tool, check the "Fill by line art detection" and select the source
see below

   

then when you don't need anymore, just delete those layers you draw to close line art