Sun, 22 Mar 2020 22:03:48 +0100 wenzelm avoid jdk-11.0.6+10: it shows problem "S8217731: Font rendering and glyph spacing changed from jdk-8 to jdk-11" https://bugs.openjdk.java.net/browse/JDK-8217731 even though the changelog claims to have resolved this;
Thu, 02 Apr 2020 12:49:53 +0200 wenzelm clarified signature: more direct Isabelle_Process.EXIT;
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