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When working in projects involving different svn tags or trunks, the current "subversion" -> "diff" functionality seems rather limited in obviously just comparing the current working copy with the state of the repository on the server. In most situations where an IDE really could be beneficial, comparisons will have to be made i.e. between - different branches / tags of a project on the server, - a local working copy and a different branch/tag on the server, - an unversioned local "junk of code" against a working copy or a server repository. This could be resolved by, i.e., adding a "Diff to..." feature allowing for comparing projects against resources other than just its own server working copy.
*** This bug has been marked as a duplicate of bug 189273 ***