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To replicate, open up any file. Type some text and do not save it. Using the mouse, select somewhere where you can then invoke the command "T" to Find File Named... Find some file and open it. Your changes to the original file are lost. Tested on Safari and Chrome both behave the same.
Small fix http://git.eclipse.org/c/orion/org.eclipse.orion.client.git/commit/?id=4e252b72588ed4e3c192e21dec5c552ca6318256