Details Pane in Solution PM UI Project list calculates negative column widths

[donnie-msft]

The ListView for the projects table in Solution PMUI calculates column widths in order to make adjustments to each column. The ListView_SizeChanged performs several calculations, and this can result in a negative value.

Recently, a regression (#13928) was introduced in this area as Transitive Vulnerabilities were added as a column to this table. When the Details Pane is small, this logic would set a negative width on the column.
To mitigate this, a fix was made (in NuGet/NuGet.Client#6146) to check for and only set a positive value for width.

Example of a negative calculation from the debugger:

This logic seems overly complicated. Ideally:

• Try to use WPF built-in settings to manage the column widths
• If customization is needed, try refactoring the ListView_SizeChanged event to minimize the calculations it performs. Perhaps bailing out of the loop as soon as the width variable turns negative would optimize it slightly.
• Re-evaluate the hard-coded values (project count > 7 and header.ActualWidth < 86 to ensure they're still correct and useful.