message: Tweak placement target for tags selection (win)
diff: xmlns:toggl="clr-namespace:TogglDesktop"
  mc:Ignorable="d" d:DesignWidth="300" d:DesignHeight="34"
  MouseDown="onMouseDown">
  - <Border Style="{StaticResource Toggl.Border.Hoverable}" Background="{DynamicResource Toggl.SelectionElements.Background}">
  - <Grid Name="grid" x:FieldModifier="private">
  + <Border Name="border" Style="{StaticResource Toggl.Border.Hoverable}" Background="{DynamicResource Toggl.SelectionElements.Background}">
  + <Grid>
  <WrapPanel Name="panel" x:FieldModifier="private" Orientation="Horizontal" Margin="10, 1, 30, 1"
  SizeChanged="panel_OnSizeChanged">
  <toggl:ExtendedTextBox x:Name="textBox" x:FieldModifier="private" MinWidth="80" Margin="-3, -1, 3, -1" BorderThickness="0" Padding="0 0 34 0"
  Width="30"/>
  <toggl:AutoCompletionPopup x:Name="autoComplete" x:FieldModifier="private"
  - Target="{Binding ElementName=grid}" TextBox="{Binding ElementName=textBox}"
  + Target="{Binding ElementName=border}" TextBox="{Binding ElementName=textBox}"
  DropDownButton="{Binding ElementName=dropDownButton}"
  ConfirmCompletion="autoComplete_OnConfirmCompletion"
  ConfirmWithoutCompletion="autoComplete_OnConfirmWithoutCompletion"
  