add one liner.

For InDesign.
Select a paragraph that has 2 or more lines. Run it and press horizontal scale to fit one line.

Author: Ten

pressSelectedParagraphTo1line.jsx

@@ -0,0 +1 @@
+var t=app.selection[0];var s=100;while(t.lines.length>1)t.paragraphs[0].horizontalScale=--s;