The renderers in the narrow column in ltr-oriented GtkTreeView is
clipped. However, the renderers in the narrow columns in rtl-oriented
GtkTreeView is not clipped.

Here's the detail of the bug:

*) testtreeview-for_rendererclip-20031127.patch is not necessary for
   fixing the bug. It is used to reproduce this bug.
   (I'll attach the patch as a comment.)

*) If you applyed patch for Bug #127874 before looking at this issue, 
   you can understand this bug more clearly.

[Steps to Reproduce]
1. Apply testtreeview-for_rendererclip-20031127.patch to
   ./tests/testtreeview.c. The following changes are performed:
   - Create columns with empty titles and without images
   - Increase length of text
   - Make columns resizable
   and so on.
2. Run ./tests/testtreeview demo in bidi locale.
3. Make a width of column shorter.
   The contents of cell are displayed with overlapping. <-- Problem

[Actual Results]
Contents of cell isn't clipped when its width (or total width of all
renderers from current column) is greater than the width of column.

[Expected Results]
Contents of cell should be clipped like ltr-oriented GtkTreeView
if total width of all renderers is greater than the width of column.