sometimes, clicking on the history button also clicks the 'i' button underneith - this fixes that
sometimes, clicking on the history button also clicks the 'i' button underneith - this fixes that

HageMaster3108/webapps-scientific-calculator,davidmaxwaterman/webapps-scientific-calculator,modulexcite/webapps-scientific-calculator,i-devil/webapps-scientific-calculator,01org/webapps-scientific-calculator,modulexcite/webapps-scientific-calculator,01org/webapps-scientific-calculator,davidmaxwaterman/webapps-scientific-calculator,i-devil/webapps-scientific-calculator