First TreeViewColumn is not rendering

Question

I have an window defined in a gtk-builder file made with Glade. It contains a gtk.Window, with a child gtk.TreeView with 2 gtk.TreeViewColumns:

<?xml version="1.0" encoding="UTF-8"?>
<interface>
    <requires lib="gtk+" version="2.20"/>
    <!-- interface-naming-policy project-wide -->
    <object class="GtkWindow" id="bookmarks_window">
        <property name="can_focus">False</property>
        <property name="events">GDK_KEY_PRESS_MASK | GDK_STRUCTURE_MASK</property>
        <property name="title" translatable="yes">Bookmarks</property>
        <property name="modal">True</property>
        <property name="default_width">350</property>
        <property name="default_height">200</property>
        <property name="destroy_with_parent">True</property>
        <property name="type_hint">menu</property>
        <property name="skip_taskbar_hint">True</property>
        <child>
          <object class="GtkScrolledWindow" id="bookmarks_scroll">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="hscrollbar_policy">never</property>
            <property name="vscrollbar_policy">automatic</property>
            <child>
              <object class="GtkTreeView" id="bookmarks_tree">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="events">GDK_BUTTON_PRESS_MASK | GDK_KEY_PRESS_MASK | GDK_STRUCTURE_MASK</property>
                <property name="headers_visible">False</property>
                <property name="headers_clickable">False</property>
                <property name="rules_hint">True</property>
                <property name="fixed_height_mode">True</property>
                <property name="show_expanders">False</property>
                <property name="enable_grid_lines">vertical</property>
                <child>
                  <object class="GtkTreeViewColumn" id="line_column">
                    <property name="sizing">fixed</property>
                    <property name="title" translatable="yes">Line</property>
                  </object>
                </child>
                <child>
                  <object class="GtkTreeViewColumn" id="text_column">
                    <property name="sizing">fixed</property>
                    <property name="title" translatable="yes">Text</property>
                  </object>
                </child>
              </object>
            </child>
          </object>
        </child>
    </object>
</interface>

I'm creating the window doing:

def show_window(parent_window):
    builder = gtk.Builder()
    builder.add_from_file("mywindow.ui")

    window = builder.get_object('bookmarks_window')
    window.set_transient_for(parent_window)

    tree = builder.get_object('bookmarks_tree')
    tree.set_search_column(1)

    store = gtk.TreeStore(int, str)
    for i in xrange(1, 6):
        store.append((i, "Line {}".format(i)))
    tree.set_model(store)

    line_renderer = gtk.CellRendererText()
    line_column = builder.get_object('line_column')
    line_column.pack_start(line_renderer)
    line_column.set_attributes(line_renderer, text=0)

    text_renderer = gtk.CellRendererText()
    text_column = builder.get_object('text_column')
    text_column.pack_start(text_renderer)
    text_column.set_attributes(text_renderer, text=1)

    window.show_all()

This will only show the "Text" column:

+---------------+
| Line 1        |
| Line 2        |
| Line 3        |
| Line 4        |
| Line 5        |
+---------------+

If I change the order of the gtk.TreeViewColumns in the interface file from:

<child>
  <object class="GtkTreeViewColumn" id="line_column">...</object>
</child>
<child>
  <object class="GtkTreeViewColumn" id="text_column">...</object>
</child>

to:

<child>
  <object class="GtkTreeViewColumn" id="text_column">...</object>
</child>
<child>
  <object class="GtkTreeViewColumn" id="line_column">...</object>
</child>

Only the "Line" column will display:

+---------------+
| 1             |
| 2             |
| 3             |
| 4             |
| 5             |
+---------------+

But I want it to look like:

+---+-----------+
| 1 | Line 1    |
| 2 | Line 2    |
| 3 | Line 3    |
| 4 | Line 4    |
| 5 | Line 5    |
+---+-----------+

Changing the order of the gtk.TreeViewColumns in the interface file is changing what column is displayed, which doesn't make sense to me. It's always hiding the first column. Does anyone know what I am missing or overlooking? Any help would be appreciated.

Answer 1

You set column sizing mode to "fixed" (I assume you need this for performance reasons), yet do not set fixed-width property. Set it to any value on both columns and they will appear.