4261 - Add new fix for entering edit mode in dropdown [v4.31.x]

[tmcconechy]

Explain the details for making this change. What existing problem does the pull request solve?

Updated the fix on #3980 to solve #4261 by..

• making it happen with no timeout
• checking and ignoring certain keys
• calling api same way

Related github/jira issue (required):
Fixes #4261

Steps necessary to review your pull request (required):

• go to http://localhost:4000/components/datagrid/example-editable.html
• click in the grid and arrow to the Action field
• type a key like a or b and the dropdown should open and filter
• reset
• click in the grid and arrow to the Action field hit enter -> this will enter edit mode but wont open
• now type a and it should filter
• reset
• click in the grid and hit F2 to toggle "tabs mode"
• tab to the Action field -> this will enter edit mode but wont open
• now type a and it should filter
• try various tests of tabbing and arrowing and typing see if you can bust it