main: Add warning about APFS resizes looking like a freeze

Signed-off-by: Hector Martin <[email protected]>

Author: marcan

src/main.py

@@ -588,6 +588,9 @@ def action_resize(self, resizable):
                     continue
                 else:
                     p_warning(f"That's not enough free space for an OS install.")
+            print()
+            p_message("Note: your system may appear to freeze during the resize.")
+            p_message("This is normal, just wait until the process completes.")
             if self.yesno("Continue?"):
                 break