Run scripter
load or type a multiline script
move cursor to a line, press tab/shift-tab.
select 2 or more lines press tab/shift tab.
select empty lines or lines with only whitespace and press tab/shift-tab
In each case:
Confirm shift tab stops dedenting at left hand margin for each line independently
Confirm tab does not add indents to whitespace-only lines.
Move cursor to middle of text - no selection, press tab - line should indent, no whitespace should be inserted in middle of text
move cursor to end of line, press return press tab - should add whitespace to start typing indented code