macosx: Fix minimum sizing of library split views
This prevents some nasty crashing/bugs caused by letting the main view pane become too small
After fix:
Screen_Recording_2023-04-14_at_15.34.58
Before fix:
Screen_Recording_2023-04-14_at_15.37.43
Signed-off-by: Claudio Cambra developer@claudiocambra.com
Edited by Claudio Cambra