I see that Professor Loraine has commented asking about GUI builder. It seems that for adding Edit button, we may have to use a GUI builder. I realized this while working on https://jira.transvar.org/browse/IGBF-2012 - Improve Edit App repository function. The code changes done by Noor Zahara almost are the same with additional code for https://jira.transvar.org/browse/IGBF-2012.

Prutha Kulkarni No need to answer - I see you meant "Web browser"

We don't need to support backslash "\" characters. Since all other functionality is working as per testing, I am moving this to "Closed".

Prutha Kulkarni Thank you for documenting this edge case! A question: by "browser" do you mean IGB or a Web browser?

Noor Zahara, I have tested the edit button functionality on IGB for the cases mentioned below:
1) Editing http to https
2) Adding a url and then removing trailing path separators
3) Editing existing urls to incorrect paths
4) Editing correct local folder paths to incorrect ones
5) Removing an entry
6) Editing the name field for any entry using Edit button
7) Renaming any entry with the same name as that of any other entry in the table.
Everything is working fine.
I have one doubt. When I replaced all of the forward slashes in the URL with backward slashes then it is showing me "invalid url" message even when the location can be easily accessed with the backward slashes using the browser.
I am not sure if that should work with the backward slashes or it should prompt a "invalid url" message.
URL used:
https:\\bitbucket.org\skulka2710\get-average-score\downloads\
[~aloraine] - could you please let me know if that should be handled in the code?
If there is no need to handle this case then I will move it forward to DONE.

Sorry Prutha Kulkarni and Noor Zahara I did not get back to you in a timely fashion regarding latest comment.
Let's proceed with current fix as it has passed code and functional review.
Moving to "ready for pull request".