fix #2547 -- in jupyter, clicking from formatted markdown cell to code cell unformats the markdown
fix #2547 -- in jupyter, clicking from formatted markdown cell to code cell unformats the markdown

DrXyzzy/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,sagemathinc/smc,DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc