20598
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10260 backport 2.0: 10258 DivideByZero in SystemProgressMorph
https://pharo.fogbugz.com/f/cases/10260
10109 MNU : SmalltalkEditor>>browseItHere:
https://pharo.fogbugz.com/f/cases/10109
Diff information: http://ss3.gemstone.com/ss/Pharo20/Kernel-MarcusDenker.1346.diff
