spec: fix two brittle specs

Change-Id: I313670b89c91317754e7a268b1bcadad8e8db434
Reviewed-on: https://gerrit.instructure.com/89383
Tested-by: Jenkins
Reviewed-by: Landon Wilkins <lwilkins@instructure.com>
Product-Review: Landon Wilkins <lwilkins@instructure.com>
QA-Review: Landon Wilkins <lwilkins@instructure.com>

Author: jenseng

spec/selenium/helpers/groups_common.rb

@@ -169,13 +169,11 @@ def manually_set_groupset_limit(member_limit = "2")
 
   def manually_fill_limited_group(member_limit ="2",student_count = 0)
     student_count.times do |n|
-      # Finds all student add buttons and updates the through each iteration
-      studs = ff('.assign-to-group')
-      studs.first.click
-
-      wait_for_ajaximations
+      f('.assign-to-group').click
       f('.set-group').click
       expect(f('.group-summary')).to include_text("#{n+1} / #{member_limit} students")
+      # make sure the popover is gone; it takes 100ms, and its on('close') -> focus can mess up the next click
+      expect(f('body')).not_to contain_css('.set-group')
     end
     expect(f('.show-group-full')).to be_displayed
   end