A script is working properly on Mac, but not Windows. Users are expected to paste multi-line text into a text field. The Windows version is clipping that text to the first line, where as the Mac version allows the whole block to be pasted in.
Example input:
Some text
that spans
multiple lines
On paste, windows clips to:
Some text
The 'multiline' property has no noticeable effects.
function addLongTextField(panel) {
panel.filenamesText = panel.add("EditText",undefined,"")
panel.filenamesText.minimumSize = [400,200];
panel.filenamesText.multiline = true;
return panel
}