title: python GTK3 limit label width
body: <p>I've got a set of labels in a flowbox, the problem is that I would like for these labels to be 96px wide at most. I've set label.set_ellipsize(True), but since the flowbox gives them as much room as they like they don't get ellipsized, even though I've set their size request to 96px wide.</p>
  
  <p><img src="https://i.stack.imgur.com/5t1c5.png" alt="problem example"></p>
  
  <p>I've tried every function I could find that seemed even tangentially related on all the widgets involved, but nothing seems to work.</p>
  
  <p>the only workaround I did find was using set_min_children_per_line() but that requires calculating the number of children from the flowbox width which is dependent on the number of children per row, leading to a flowbox that gets really wide real quick.</p>
  
  <p>I'm probably missing something obvious, but I've been bashing my head on this problem for days now.</p>
  
  <p>I've made this testcase that exhibits the problem when amount of columns isn't divisible by two:</p>
  
  <pre><code>from gi.repository import Gtk as gtk
  from gi.repository import Pango as pango
  
  class Widget(gtk.VBox):
      def __init__(self,label):
          gtk.VBox.__init__(self)
  
          image=gtk.Image.new_from_icon_name("image-missing",gtk.IconSize.DIALOG)
          image.set_size_request(96,96)
          self.add(image)
  
          lbl=gtk.Label(label)
          self.add(lbl)
  
  
  class TestCase(gtk.Window):
      def __init__(self):
          gtk.Window.__init__(self)
          lbl=gtk.Label("some text")
          scrollbox=gtk.ScrolledWindow()
          self.add(scrollbox)
          flowbox=gtk.FlowBox()
          scrollbox.add(flowbox)
          for i in range(50):
              w=Widget("longlabel"*5)
              flowbox.add(w)
              w=Widget("short")
              flowbox.add(w)
  
  if __name__=="__main__":
      w=TestCase()
      w.connect("delete-event",gtk.main_quit)
      w.show_all()
      gtk.main()
  </code></pre>