Fix 652 - Bootstrap 4 dropdown-menu use 'show' instead of 'open' #4241
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Fixes the issue that occurs in the filter "rule component", i.e. when selecting an attribute in the filter tool, the dropdown menu was not opened. Clicking on the drop-down list did show the menu, but in the background we had a broken state.
Cause: in Bootstrap 4, the class
show
has to be used on the element with the css classdropdown-menu
, see (inspect the drop down menu when opened, you'll see the "show" css class name":https://www.w3schools.com/bootstrap4/tryit.asp?filename=trybs_dropdown-menu&stacked=h
In Bootstrap 3, this was different. The css class
open
had to be set on the element with thedropdown
css class.