For the previous example, it would output the following:

Scheduling

To find out where your events happen relative to the frame’s
begin/end, you can toggle the debugPrintBeginFrameBanner
and the debugPrintEndFrameBanner booleans to print the
beginning and end of the frames to the console.

For example:

The debugPrintScheduleFrameStacks flag can also be used
to print the call stack causing the current frame to be scheduled.

Debug flags: layout

You can also debug a layout problem visually, by setting
debugPaintSizeEnabled to true.
This is a boolean from the rendering library. It can be
enabled at any time and affects all painting while it is true.
The easiest way to set it is at the top of your void main()
entry point. See an example in the following code: