eclipse xml editor inserts tabs for spaces
Not sure about this issue with the XML editor specifically, but I use the AnyEdit tools plugin to handle any tabs/spaces issues.
Once you've installed the plugin go to Preferences -> General -> Editors -> AnyEdit Tools and you can enable auto conversion of tabs to spaces (or vice versa) whenever you save a file. I find this very useful because it will also fix any files you've accidentally inserted tabs into when you change those files.
This plugin also provides a nice set text functions to use in the 'Convert' section of the right click menu of any text editor.
