Set the other columns as explicitly using the default font, to work around the previous issue (but still pack columns, for consistency).
bin.includes = .,\
META-INF/,\
icons/,\
plugin.xml,\
html/,\
Tools/,\
tocCodeScanner.xml,\
book.css,\
CodeScannerPlugin.jar,\
index/
jars.compile.order = CodeScannerPlugin.jar
source.CodeScannerPlugin.jar = src/
output.CodeScannerPlugin.jar = bin/