How to track rows between two specific occurrences in a column?

I have a following dataframe:

How to keep track of occurrences when a specific user is working on a specific tab in a way as shown on the following image? For example: In the first row, user A opened a "Tab Alpha" and I would like to store the value "Tab Alpha" in a newly generated column "User A" in each row until the value "Tab Alpha closed by User A".

Expected output:

Link to dataframe: https://docs.google.com/spreadsheets/d/1vt5TgYRwMTA8X26S7BtjrXudM_Vih4BUT0AzfQJbO_I/edit?usp=sharing

source https://stackoverflow.com/questions/72027479/how-to-track-rows-between-two-specific-occurrences-in-a-column

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