StatusStrip label not visible when text too long

You can create a custom renderer based on ToolStripProfessionalRenderer and override OnRenderItemText method and draw text with ellipsis:

public class CustomRenderer : ToolStripProfessionalRenderer
{
    protected override void OnRenderItemText(ToolStripItemTextRenderEventArgs e)
    {
        if (e.Item is ToolStripStatusLabel)
            TextRenderer.DrawText(e.Graphics, e.Text, e.TextFont,
                e.TextRectangle, e.TextColor, Color.Transparent,
                e.TextFormat | TextFormatFlags.EndEllipsis);
        else
            base.OnRenderItemText(e);
    }
}

Then it's enough to set Renderer of your StatusStrip to your custom renderer:

this.statusStrip1.Renderer = new CustomRenderer();

In below example, You can see the behavior of a ToolStripStatusLabel which it's Spring property is set to true and its StatusStrip uses CustomRenderer:

On Visual Studio 2017, the accepted answer didn't work for me. So here is another simple solution. Set LayoutStyle property of StatusStrip to Flow. i.e:

 statusStrip1.LayoutStyle= LayoutStyle.Flow;

And Set

`statusStrip1.AutoSize= false;`

If you set

ToolStripStatusLabel.Spring = True;

then you won't get the "..." but the text will be shown even when the available space is insufficient.