An IDEA bug?
Run the source code I attached here, it will show a Window with a text area. Then copy the source code and paste into the text area.
When I do as above, I have these lines in Run toolwindow
Attachment(s):
MultipleWindowsDemo.java
Histogram.java
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It only happens when I copy the source code from IDEA editor then paste into the text area. And no problem if I copy the source code from Notepad.
It happens even with a very simple program. And it happens with JTextArea and JTextField.