bug: rename table with sequential underscores moves cursor to end of string

[jimniels]

Describe the bug

When you rename a table, either in the code editor header or in the table on the sheet, if you have multiple underscores sequentially and hit "space", it inserts another underscore and then moves the cursor position to the end.

https://github.com/user-attachments/assets/abfd7405-435e-41de-8868-b5e09cc7343a

https://github.com/user-attachments/assets/1597a47e-e659-4424-a967-31248fdea093

Expected behavior

The cursor position should never jump to the end. It should always stay where it was when a keypress is made.