Excel has a CurrentRegion Method that is invoked as 
Range(range_string).CurrentRegion

The Idea behind this is to choose a region that have contiguous blank cells on all sides ( except the case of 1 column and 1 row ) that separate

I have Python code that I written to accomplish this Method. I have extended the CellRange class and added the methodand it is working as expected.

Please let me know if this will be a useful feature and I will submit code. It may not be the best code, but has performed well and correctly in all my testing so far 

Please see example snap shots attached fro Current Region is expected to work (for reference from the link
https://www.excel-easy.com/vba/examples/currentregion.html

Here is additional reference to the Method as implemented in Excel VBA
https://docs.microsoft.com/en-us/office/vba/api/excel.range.currentregion

This is the issue tracker for Python itself, not openpyxl, so this isn't the right place to report this. I would go to openpyxl's website and see where they specify to report bugs.