update: float fdm

hypr/conf/windowrules/custom.conf

@@ -18,3 +18,4 @@ windowrule = float,title=^(Mathematica)$
 windowrule = opacity 0.75, ^(Code)$
 windowrule = opacity 0.75, ^(code-url-handler)$
 windowrule = float,^(QQ)$
+windowrule = float,^(fdm)$