make double sure that AWT/Swing antialiasing is enabled (see also http://www.jedit.org/users-guide/jvm-options.html and jdk/src/share/classes/sun/awt/SunToolkit.java);

src/Pure

src/FOL

src/HOL

src/ZF

src/CCL

src/CTT

src/Cube

src/FOLP

src/LCF

src/Sequents

src/Doc

src/Tools