Resize PM UI checkbox texts to correct size

Author: martinrrm

src/NuGet.Clients/NuGet.PackageManagement.UI/Xamls/PackageManagerTopPanel.xaml

@@ -189,9 +189,24 @@
         <Grid.ColumnDefinitions>
           <ColumnDefinition MaxWidth="320" MinWidth="118"/>
           <ColumnDefinition Width="auto" />
-          <ColumnDefinition MaxWidth="125" />
-          <ColumnDefinition MaxWidth="150"/>
+          <ColumnDefinition MaxWidth="{Binding ActualWidth, ElementName=_measurerPrerelease}" />
+          <ColumnDefinition MaxWidth="{Binding ActualWidth, ElementName=_measurerVulnerabilities}" />
         </Grid.ColumnDefinitions>
+
+        <!-- hidden text measurers mirror the checkbox labels so we can bind MaxWidth -->
+        <TextBlock
+          x:Name="_measurerPrerelease"
+          Visibility="Hidden"
+          Text="{x:Static nuget:Resources.Checkbox_IncludePrerelease}"
+          FontSize="{Binding FontSize, RelativeSource={RelativeSource AncestorType=UserControl}}"
+          FontFamily="{Binding FontFamily, RelativeSource={RelativeSource AncestorType=UserControl}}"/>
+        <TextBlock
+          x:Name="_measurerVulnerabilities"
+          Visibility="Hidden"
+          Text="{x:Static nuget:Resources.Checkbox_Show_Vulnerable_Only}"
+          FontSize="{Binding FontSize, RelativeSource={RelativeSource AncestorType=UserControl}}"
+          FontFamily="{Binding FontFamily, RelativeSource={RelativeSource AncestorType=UserControl}}"/>
+
         <!-- container of the search control -->
         <Border
           Grid.Column="0"

src/NuGet.Clients/NuGet.PackageManagement.UI/Xamls/PackageManagerTopPanel.xaml.cs

@@ -43,6 +43,51 @@ public PackageManagerTopPanel()
             var cvs = Resources["cvsPackageSources"] as CollectionViewSource;
             cvs.Culture = CultureInfo.DefaultThreadCurrentUICulture;
             cvs.Source = PackageSources;
+
+            // Hook Loaded so we can measure hidden text measurers and set column MaxWidth.
+            Loaded += PackageManagerTopPanel_Loaded;
+        }
+
+        private void PackageManagerTopPanel_Loaded(object sender, RoutedEventArgs e)
+        {
+            // Perform an immediate measurement to initialize column widths.
+            UpdateMeasuredColumnWidths();
+        }
+
+        private void UpdateMeasuredColumnWidths()
+        {
+            try
+            {
+                if (_measurerPrerelease == null || _measurerVulnerabilities == null || _checkboxPrerelease == null)
+                {
+                    return;
+                }
+
+                // Measure the hidden TextBlocks with infinite available width so they compute their natural width.
+                _measurerPrerelease.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
+                _measurerVulnerabilities.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
+
+                double w1 = _measurerPrerelease.DesiredSize.Width;
+                double w2 = _measurerVulnerabilities.DesiredSize.Width;
+
+                // Add some slack to account for the checkbox glyph and margins.
+                const double extra = 28.0;
+
+                var parentGrid = _checkboxPrerelease.Parent as Grid;
+                if (parentGrid != null && parentGrid.ColumnDefinitions.Count > 3)
+                {
+                    parentGrid.ColumnDefinitions[2].MaxWidth = w1 + extra;
+                    parentGrid.ColumnDefinitions[3].MaxWidth = w2 + extra;
+                }
+            }
+            catch (InvalidOperationException)
+            {
+                // Swallow exceptions from layout/measure to avoid breaking UI initialization.
+            }
+            catch (ArgumentException)
+            {
+                // Swallow exceptions from layout/measure to avoid breaking UI initialization.
+            }
         }
 
         public void CreateAndAddConsolidateTab()