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A recent fix, for 7.2 I think, displayed diffs of file renames in Mercurial-controlled sources naturally, or at least better than before: you could see line-by-line changes, if any, made in addition to the rename. But this is still broken for Git: if you rename a file, the Diff view just shows it as a delete and an add, and there is no way to tell from the IDE whether any other changes to file contents were made.
fix: http://hg.netbeans.org/core-main/rev/fbf8441b6818
Integrated into 'main-golden', will be available in build *201205040400* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/fbf8441b6818 User: Ondrej Vrabec <ovrabec@netbeans.org> Log: #211908 - Show Git renames naturally in Diff view