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Here's a link to a forum thread on this issue:

https://forums.opensuse.org/showthread.php/503103-CODE-blocks-are-broken-in-quot-konqueror-quot

I noticed that code blocks were not working correctly in "konqueror" and
"rekonq" and reported that at the forum.

The suggestion was made, that I change the konqueror fixed font from its
default ("Liberation Mono") to something like Courier which was known to be
fixed width.

I tried that.  It fixed the problem.  Then I changed back to "Liberation Mono",
and the problem stayed fixed.

It seems that before I configured that font, it was not actually using the
"Liberation Mono" that its configuration said it was using.

This looks like a problem with initial setup of "konqueror".  And "rekonq" has
the same problem -- maybe "akregator" has the problem too, but I didn't try to
check that.

I'm not sure if this is an opensuse bug or an upstream KDE bug.  But I'll start
here.

Reproducible: Always