git_ui: Expand commit editor hitbox by setting min_lines = max_lines (#38587)

Closes #26527

The commit editor hitbox was too small since min_lines < max_lines,
making it grow only when typing more lines.

Release Notes:

- N/A


https://github.com/user-attachments/assets/e026d688-594f-40b6-a971-6c92e3fdb496
179fb21778Nomad committed on 10/2/2025, 2:44:18 PM· committed by GitHubparent6584fb2
1 file changedLine totals unavailable