message: Fix Autocomplete popup width to always equal to corresponding input field width (win)
diff: BorderBrush="{DynamicResource Toggl.ComboBoxPopupBorderBrush}"
  BorderThickness="1"
  Background="{DynamicResource Toggl.CardBackground}"
  - MinWidth="{Binding ElementName=popup, Path=PlacementTarget.ActualWidth}">
  + MinWidth="{Binding ElementName=popup, Path=PlacementTarget.ActualWidth}"
  + MaxWidth="{Binding ElementName=popup, Path=PlacementTarget.ActualWidth}">
  <Border.Effect>
  <DropShadowEffect ShadowDepth="1" BlurRadius="4" Direction="270" Opacity="0.2" Color="Black" />
  </Border.Effect>
  HorizontalContentAlignment="Stretch"
  VirtualizingStackPanel.VirtualizationMode="Recycling"
  ItemTemplateSelector="{StaticResource autocompleteTemplateSelector}"
  + ScrollViewer.HorizontalScrollBarVisibility="Disabled"
  PreviewMouseDown="listBox_PreviewMouseDown">
  </ListBox>
  <Button x:Name="createProjectButton" x:FieldModifier="private"
  