I'm using WYSIWYG #6 along with MW 1.31 (see exact specifications at the end of this post)
it works well except one little annoying bug :
When I want to edit a page the blocs containing text in the Division text format are switched to Normal text format and it looses line breaks
See those two pictures to illustrate the problem
This bug is even more annoying since when creating a new page it's the Division text format which is used by default.
I tried to tweak CKeditor config.js file to remove Division text format but without success.
I didn't find any instructions about how to make Normal text format the default text format used instead of Division text format, please tell me if you know how to do this.
Also this bug messes up pages I created with MW 1.30 and an older version of WISIWYG extension (I installed it around february 2018)
I exported those pages and imported them to the new wiki.
Those pages contain lots of layered div blocks and when I try to edit those pages all div blocks are merged into one, losing line breaks.
I found a workaround by using the Remove Format button, it seems like by doing that the div blocks are stuck and will not be merged into one even when saving changes. By looking closer I understood that this trick converts all the <div class="mw-parser-output"> elements into simple <div> elements.
It's not a very elegant solution but it's handy enough for me.
PHP 7.3.0 (fpm-fcgi)
WikiEditor 0.5.1WYSIWYG editor Wysiwyg 1.5.6_0 [B551+18.09.2018], CKEditor 4.6.2 (revision 20af917)