BUG: Selecting cells/columns with shift and/or command does not work as expected

[cole-at-quadratic]

1. Holding shift+CMD and pressing the down arrow key only selects the first range of cells before an empty cell, and does not continue expanding the selected range when clicking down more times
2. After selecting a range, holding shift and pressing right or left does not select the same rows in the next column
3. Selecting a range of cells beyond the fold does not work as expected, making it nearly impossible to select a large range of data
4. After selecting a column or row and holding shift then pressing an arrow key does not select the next column/row, it moves the selection to a cell
5. Selecting multiple columns or rows and right clicking does not work.

https://app.arcade.software/share/YTqsalFPZ5NLRh4kpjwn