flutter-fix-layout-issues

Flutter layout operates on a strict rule: Constraints go down. Sizes go up. Parent sets position. Layout errors occur when this negotiation fails, typically due to unbounded constraints or unconstrained children. Diagnose layout failures using the following error signatures: Copy and use this checklist to systematically resolve layout constraint violations. Input (Error State): Output (Resolved State): Input (Error State): Output (Resolved State): Input (Error State): Output (Resolved State): - Constraint Violation Diagnostics - Layout Error Resolution Workflow - Examples - "Vertical viewport was given unbounded height" : Triggered when a scrollable widget ( ListView , GridView ) is placed inside an unconstrained vertical parent ( Column ). The parent provides infinite height, and the child attempts to expand infinitely. - "An InputDecorator...cannot have an unbounded width" : Triggered when a TextField or TextFormField is placed inside an unconstrained horizontal parent ( Row ).