Copy and pasting text between files causes leading whitespace to be trimmed in Xcode

In Xcode 4, I'm having a problem with leading white space (it's being trimmed), when copy and pasting between files. In the hex dump, I see 0x20s in the source, but not in the copy; this means the text is being changed on paste.

I开发者_Python百科n preferences > text editing > indentation, I have prefer indent using: spaces and tab key: indents in leading white space set.

This doesn't happen on trailing whitespace. How can I fix this problem?

You can try to use Edit > Paste and Preserve Formatting in Xcode. I can see it in version 5.1 but can't tell if it was there before. There is a keyboard combination for it, too: Alt+Caps+Command+C.

In that same Preferences > Text Editing > Indentation screen, try unchecking the Syntax-aware indenting option.