Scrolling through output jumps

[frabcus]

If you scroll up the output console, it jumps down to bottom (even if no content has appeared - it shouldn' t jump anyway, and certainly not then!)

[frabcus]

Hmm, this isn't so simple.

This was still a bit jumpy:

        var sel = output.getSelection().getRange()
        var row = output.getFirstVisibleRow()
        output.setValue(text)
        output.getSelection().setSelectionRange(sel)
        output.scrollToRow(row)

Maybe save all of output.getSession() and restore? Will that break things?

[frabcus]

What it should do is keep you stuck to the bottom of the output if already were at the bottom. Otherwise, to keep you looking at what you were.

Extra complicated when things are being trimmed to 10,000 lines.