ide: After reloading a unit, restore the previous scroll position.
ide: After reloading a unit, restore the previous scroll position.

This needs some more improvement, by also restoring the edit cursor
position. But for this, the fpg_textedit needs to be improved first.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI