The following forum message was posted by mvschenkelberg at http://sourceforge.net/projects/pydev/forums/forum/293649/topic/3953177:
I have noticed that when you open a readonly file in almost every editor, the
contents cannot be changed at all. But in pydev editor, everything is disabled
except the delete key, you can delete text then it marks the file as dirty and
you can save which then throws an error. Any ideas about what is causing this/how
I might be able to fix it from code? (I am opening the editor programatically
myself but also noticed the issue in eclipse as well).