Text overflows its container boundary

Why This Happens

In Flutter, long text inside a Row or other constrained widget can overflow. Without TextOverflow handling, the text renders beyond its boundary. Use overflow, maxLines, and optionally Expanded or Flexible to manage long text.

The Problem

Row(
  children: [
    Icon(Icons.person),
    Text('This is a very long username that will overflow'),
  ],
)

The Fix

Row(
  children: [
    Icon(Icons.person),
    Expanded(
      child: Text(
        'This is a very long username that will overflow',
        overflow: TextOverflow.ellipsis,
        maxLines: 1,
      ),
    ),
  ],
)

Step-by-Step Fix

1. 1

   Identify the error

   Look at the RenderFlex overflow error pointing to a Row or similar widget containing text.

2. 2

   Find the cause

   Check if a Text widget in a Row lacks Expanded wrapping and overflow handling for long content.

3. 3

   Apply the fix

   Wrap the Text in Expanded and set overflow: TextOverflow.ellipsis with maxLines to handle long text.