I looked for a nice font using the Extras - Font Preview dialog in Scribus, and
used cursor-down to see one font after the other. When I reached the "Noto
Color Emoji Regular" font, Scribus was hanging and eating 100% CPU.

Reproducer:
- start Scribus (if you have it already running, make sure to save all
documents)
- create a new empty document to "unlock" the Extras - Font Preview menu entry
- click the Extras - Font Preview menu item
- in the font preview dialog, select "Noto Color Emoji Regular"

Result: Scribus hangs with 100% CPU load.

As a sidnote: the font selection in the properties dialog doesn't even offer to
select this font.