Fix issues #3820 expand=False didn't work when it contains Columns

CONTRIBUTORS.md

@@ -70,6 +70,7 @@ The following people have contributed to the development of Rich:
 - [Damian Shaw](https://github.com/notatallshaw)
 - [Nicolas Simonds](https://github.com/0xDEC0DE)
 - [Aaron Stephens](https://github.com/aaronst)
+- [Stranger](https://github.com/Stranger-Jie)
 - [Karolina Surma](https://github.com/befeleme)
 - [Gabriele N. Tornetta](https://github.com/p403n1x87)
 - [Nils Vu](https://github.com/nilsvu)

rich/columns.py

@@ -6,7 +6,7 @@
 from .align import Align, AlignMethod
 from .console import Console, ConsoleOptions, RenderableType, RenderResult
 from .constrain import Constrain
-from .measure import Measurement
+from .measure import Measurement, measure_renderables
 from .padding import Padding, PaddingDimensions
 from .table import Table
 from .text import TextType
@@ -170,6 +170,29 @@ def iter_renderables(
             add_row(*row)
         yield table
 
+    def __rich_measure__(
+        self, console: "Console", options: "ConsoleOptions"
+    ) -> "Measurement":
+        title = self.title
+        _, right, _, left = Padding.unpack(self.padding)
+        padding = left + right
+        renderables = [*self.renderables, title] if title else [*self.renderables]
+
+        maximum_width = sum(
+            measure_renderables(
+                console,
+                options.update_width(options.max_width - padding - 2),
+                [renderable],
+            ).maximum
+            for renderable in renderables
+        )
+
+        if self.width is None:
+            width = maximum_width + padding + 2
+        else:
+            width = self.width
+        return Measurement(width, width)
+
 
 if __name__ == "__main__":  # pragma: no cover
     import os

tests/test_panel.py

@@ -3,6 +3,7 @@
 import pytest
 
 from rich.console import Console
+from rich.columns import Columns
 from rich.panel import Panel
 from rich.segment import Segment
 from rich.style import Style
@@ -16,6 +17,8 @@
     Panel(Panel("Hello, World", padding=0), padding=0),
     Panel("Hello, World", title="FOO", padding=0),
     Panel("Hello, World", subtitle="FOO", padding=0),
+    Panel(Columns(["Hello", "World"]), padding=0),
+    Panel(Columns(["Hello", "World"]), expand=False, padding=0),
 ]
 
 expected = [
@@ -26,6 +29,8 @@
     "╭────────────────────────────────────────────────╮\n│╭──────────────────────────────────────────────╮│\n││Hello, World                                  ││\n│╰──────────────────────────────────────────────╯│\n╰────────────────────────────────────────────────╯\n",
     "╭───────────────────── FOO ──────────────────────╮\n│Hello, World                                    │\n╰────────────────────────────────────────────────╯\n",
     "╭────────────────────────────────────────────────╮\n│Hello, World                                    │\n╰───────────────────── FOO ──────────────────────╯\n",
+    "╭────────────────────────────────────────────────╮\n│Hello World                                     │\n╰────────────────────────────────────────────────╯\n",
+    "╭──────────────╮\n│Hello World   │\n╰──────────────╯\n",
 ]