Looks like we can't reproduce the issue or there's a problem in the test case provided.
Bug in MessageBox.prompt ... pretty sure more a layout issue.
If I pass more than 31 letters to Ext.MessageBox.prompt parameter msg, the layout of the textfield / textarea breaks it's not displayed with full width.
Here's a link to a snippet:
*EDIT BY Gary Schlosberg
Works as expected in 4.1.3, exhibits layout issue in 188.8.131.523, 184.108.40.2063
Last edited by Gary Schlosberg; 31 Jul 2013 at 5:02 PM.
Reason: Test notes.
Thanks for the report! I have opened a bug in our bug tracker.
Anyone have a workaround for this?