Add WRAP_WIDTH, WRAP_MODE tags to cell_properties_text, supported since gtk 2.8

[nguermond]

Allow text wrapping in cells in tree view.

Description of wrap-width:
https://docs.gtk.org/gtk3/property.CellRendererText.wrap-width.html

I can't figure out how to get wrap-mode to work:
https://docs.gtk.org/gtk3/property.CellRendererText.wrap-mode.html

[garrigue]

Since it is there since 2.8, this should also probably go into lablgtk2.

[garrigue]

What is your problem with wrap-mode.
Since pango_wrap_mode is already defined, the conversions should be available.

[nguermond]

When I recompile gtkTree.props I get

      propcc src/gtkTreeProps.ml,src/ogtkTreeProps.ml
Warning: no conversion for type PangoAttrList in class GtkCellRendererText
Warning: no conversion for type PangoWrapMode in class GtkCellRendererText

As a result, when cell_renderer_text_param x is called in gTree.ml,

Error: This expression has type
         [> ...
          | `WRAP_MODE of Pango.Tags.wrap_mode
          | `WRAP_WIDTH of int ]
       but an expression was expected of type
         [< ...
          | `WRAP_WIDTH of int ]
       The second variant type does not allow tag(s) `WRAP_MODE

[garrigue]

I see. You just need to add WrapMode in propcc.ml4, line 79:

  [ "Stretch"; "Style"; "Underline"; "Variant"; "EllipsizeMode"; "WrapMode" ];

Then run make dev.

[nguermond]

This seems to work!

[nguermond]

Should I make a similar pull request to master?

[garrigue]

Should I make a similar pull request to master?

No need, I'll take care of this.