PENDING

debugRepaintRainbowEnabled

You can enable this flag in the Flutter
    inspector by selecting the Highlight Repaints button.
    If any static widgets are rotating through the colors of the rainbow
    (for example, a static header), those areas are candidates for adding
    repaint boundaries.

debugPrintMarkNeedsLayoutStacks

Enable this flag if you’re seeing more layouts
    than you expect (for example, on the timeline, on a profile,
    or from a print statement inside a layout method).
    Once enabled, the console is flooded with stack traces
    showing why each render object is being marked dirty for
    layout. You can use the debugPrintStack() method from the
    services library to print your own stack traces on demand,
    if this kind of approach is useful to you.

debugPrintMarkNeedsPaintStacks