Allow manual date entry in Custom Action's application form after clicking on the date field

Roland, thanks for creating this feature request.  Wanted to expound on this a bit more for others who may come across this.

Here are the steps you can take to reproduce. I've reproduced in our production environment and in my test environment in training:

1. Engage a Custom Action that includes User Input (in my test environment, I created a Custom Action called "Test Action" which asks the user to submit Text and then a Date -- so 2 fields)
2. Click on the date field (do not use the tab key to navigate into the field)
3. Next, try to type into that field; you'll see you are unable to type the data into that field once you've clicked on it (if you TAB from the previous field to this field, you WILL be able to type into that field).

Based on what I'm seeing, it seems like there might an event listener on the date input field that listens for a click; once a click occurs, it gives focus to the date picker. Since there appears to be no exception (i.e. if the date picker is already open for instance, don't give focus to it upon click), if you click on the field, you will never be able to gain access to edit it directly unless you are able to maintain focus (click and hold the field while you type).