#154 SrcEdit: Auto-indent on paste

[Aaron Davies]

Many IDEs (Eclipse in particular) have an ability to auto-
indent pasted code. For example, if I take a couple lines
inside an if block that is indented three layers deep, cut
them out, and paste them outside that block, where the
surrounding code is indented only two layers, Eclipse will
automatically trim one layer's worth of whitespace from the
beginning of each line. Similarly, if I move it back inside, it
will have the necessary whitespace added.