do not use "editor cleverness" on selected text

This patch disables all keyhandling (as used for automatic list indention)
when some text is selected. This fixes unexpected behavior when selecting
some text at the start of a list item and hitting backspace.

lib/scripts/edit.js

@@ -152,6 +152,7 @@ function keyHandler(e){
        e.keyCode != 32) return;
     var field     = e.target;
     var selection = getSelection(field);
+    if(selection.getLength()) return; //there was text selected, keep standard behavior
     var search    = "\n"+field.value.substr(0,selection.start);
     var linestart = Math.max(search.lastIndexOf("\n"),
                              search.lastIndexOf("\r")); //IE workaround