UniformGridLayout divide by zero when resized too narrow

[oldnewthing]

Describe the bug

UniformGridLayout.GetMajorSize() divide by zero at

microsoft-ui-xaml/src/controls/dev/Repeater/UniformGridLayout.cpp

Line 346 in 268e068

const int fullLinesCount = itemsCount / itemsPerLine;

itemsPerLine is zero if the available width is smaller than the width of a single item.

The value of itemsPerLine comes from two places.

microsoft-ui-xaml/src/controls/dev/Repeater/UniformGridLayout.cpp

Lines 208 to 213 in 268e068

	const unsigned int itemsPerLine =
	std::min( // note use of unsigned ints
	std::max(1u, std::isfinite(availableSizeMinor)
	? static_cast<unsigned int>((availableSizeMinor + MinItemSpacing()) / GetMinorItemSizeWithSpacing(context))
	: itemsCount),
	std::max(1u, m_maximumRowsOrColumns));

microsoft-ui-xaml/src/controls/dev/Repeater/UniformGridLayout.cpp

Lines 331 to 333 in 268e068

	return std::min(
	static_cast<unsigned int>((availableSizeMinor + MinItemSpacing()) / GetMinorItemSizeWithSpacing(context)),
	maximumRowsOrColumns);

This is basically a copy-pasta. In both cases, if GetMinorItemSizeWithSpacing is greater than availableSizeMinor + MinItemSpacing(), then itemsPerLine is zero, which leads to the divide by zero.

itemsPerLine should probably be clamped so it cannot go below 1.

Steps to reproduce the bug

1. Download, build, and run the WinUINotes sample.
2. Create two notes.
3. Go back to the AllNotesPage and resize the window to be as narrow as possible.
4. When you get it narrower than the width of a single note, the UniformGridLayout crashes with a divide by zero.

This issue was copied from MicrosoftDocs/windows-topic-specific-samples#3

Expected behavior

No response

Screenshots

No response

NuGet package version

None

Windows version

No response

Additional context

No response