Firebird 5 ISQL will truncate lines longer than 255 when pasting (tested on Windows 10)

1. Open command prompt
2. Execute ISQL connecting to a database, i.e. isql server:dbpath
3. Open a script file in any text editor, select all and copy
4. Paste it back to ISQL prompt

If any script line has more than 255 chars, it will be truncated and script execution will fail. Attached example script.

Same script will run fine if you paste into Firebird 2.5 ISQL.

sp_test_long_line.txt