debugPrintLayouts top-level property
read / write
Log the dirty render objects that are laid out each frame.
Combined with debugPrintBeginFrameBanner, this allows you to distinguish layouts triggered by the initial mounting of a render tree (e.g. in a call to runApp) from the regular layouts triggered by the pipeline.
Combined with debugPrintMarkNeedsLayoutStacks, this lets you watch a render object's dirty/clean lifecycle.
See also:
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debugProfilePaintsEnabled, which does something similar for painting but using the timeline view.
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debugPrintRebuildDirtyWidgets, which does something similar for widgets being rebuilt.
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The discussion at RendererBinding.drawFrame.
Implementation
bool debugPrintLayouts = false