GIMP Version: 2.10.11
Operating System: Windows
GIMP Experience: New User

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How to delete this line that always appears with the "polar coordinates" filter?

With this example obviously it's simple but with complex funds I tried the tools cloning and smuge and others, sometimes it goes ...

A more complex example:

The line as in your simple example is a bug (feature?) in the polar co-ordinates filter.

For your more complex example you need to use a seamless pattern so that the two ends match.

Small workaround - use it twice (1-no To Polar, 2-yes To Polar).
Also for You a small plugin that will do it automatically:
http://gimpchat.com/viewtopic.php?f=9&t=17550

thanks MareroQ,

I will immediately test your 2 methods.

Both methods work great but obviously the plugin is faster.
thank you Mareroq!