"Insert/Edit image" button disabled

Hello,

I just updated MoinMoin to 1.9.8 after a very long time without updates.
The button "Insert/Edit image" in the GUI editor is now permanently 
disabled.
Is there a way to get it working the way it was before (specifying the 
image file name in attachment)?

It is very time-consuming to go back and forth between the GUI and text 
editors for long pages with lots of images.

Thanks for your help,
Francois


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