when "whole words" is selected but a find-string was entered that is not
a whole word, the dialog/overlay will disable the option for "whole
words". However, the dialog/overlay will keep the selection of the
button in it's internal state. By passing the findString to this method,
we can make sure that we don't try to perform a whole-words search for a
string that isn't a whole word.

See https://github.com/eclipse-platform/eclipse.platform.ui/pull/1192#discussion_r1548564603

Extracted from
https://github.com/eclipse-platform/eclipse.platform.ui/pull/1192