From 6bc51f97e499eed33a968a44fc5f357f977bf4b2 Mon Sep 17 00:00:00 2001
From: reuk <reuk@users.noreply.github.com>
Date: Wed, 13 Oct 2021 13:10:11 +0100
Subject: [PATCH] Grid:  Avoid crashing in performLayout when the grid contains
 no items

---
 modules/juce_gui_basics/layout/juce_Grid.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/modules/juce_gui_basics/layout/juce_Grid.cpp b/modules/juce_gui_basics/layout/juce_Grid.cpp
index f27b82b6f8..de0a81f510 100644
--- a/modules/juce_gui_basics/layout/juce_Grid.cpp
+++ b/modules/juce_gui_basics/layout/juce_Grid.cpp
@@ -833,6 +833,9 @@ struct Grid::AutoPlacement
     template <typename Accessor>
     static PlacementHelpers::LineRange findFullLineRange (const ItemPlacementArray& items, Accessor&& accessor)
     {
+        if (items.isEmpty())
+            return { 1, 1 };
+
         const auto combine = [&accessor] (const auto& acc, const auto& item)
         {
             const auto newRange = accessor (item);
@@ -1052,6 +1055,13 @@ struct GridTests  : public UnitTest
         using Tr = Grid::TrackInfo;
         using Rect = Rectangle<float>;
 
+        beginTest ("Layout calculation of an empty grid is a no-op");
+        {
+            const Rectangle<int> bounds { 100, 200 };
+            Grid grid;
+            grid.performLayout (bounds);
+        }
+
         {
             Grid grid;