[ruby-gnome2-devel-en] Problem with umlauts in pango markup

[Detlef W. <det...@gm...>]

Hi,

since some days I have the problem, that pango does not render Umlauts 
anymore. Here is a short example:


require 'gtk3'

markup = '<span color="red">foooäöü</span>'

win = Gtk::Window.new
box = Gtk::Box.new :vertical
win << box

area = Gtk::DrawingArea.new
win.set_default_size 200, 100
area.signal_connect(:draw) do |widget, context|
     layout = context.create_pango_layout
     layout.markup = markup
     context.move_to 25, 25
     context.show_pango_layout layout
end
box.pack_start area, :expand => true, :fill => true

label = Gtk::Label.new
label.markup = markup

box.pack_start label

win.show_all
Gtk.main


It puts a Gtk::DrawingArea and a Gtk::Label in a window. The first 
renders the markup which contains German umlauts directly with Pango to 
a drawing context. The second one shows the same markup in a label. The 
first one is not displayed, but on it shows this warning:

> Pango-WARNING **: pango_layout_set_markup_with_accel: Fehler in Zeile 1, Zeichen 42: »/« ist kein gültiges Zeichen, wenn es auf den schließenden Elementnamen »sp<« folgt; das erlaubte Zeichen ist »>«
> 	from /home/det/.gem/ruby/2.3.0/gems/gobject-introspection-3.1.2/lib/gobject-introspection/loader.rb:566:in `block in define_method'
> 	from /home/det/.gem/ruby/2.3.0/gems/pango-3.1.2/lib/pango/layout.rb:34:in `markup='
> 	from umlaut.rb:15:in `block in <main>'
> 	from /home/det/.gem/ruby/2.3.0/gems/gobject-introspection-3.1.2/lib/gobject-introspection/loader.rb:110:in `invoke'
> 	from /home/det/.gem/ruby/2.3.0/gems/gobject-introspection-3.1.2/lib/gobject-introspection/loader.rb:110:in `block in define_singleton_method'
> 	from umlaut.rb:29:in `<main>'

The label displays the markup without problems. Pango did it also right, 
since some days and some software updates ago. It is not only limited to 
umlauts, but - I think - to all characters which are not ASCII. I have 
checked the file with isutf8 and it is OK.

Can anyone confirm this problem?

I can get around the problem, if I substitute the problematic chars with 
its hex-values in a way like this:

sprintf "&#x%x;", char.ord

But this is nearly open end, if I don't want to limit the characters to 
use and very expensive in ruby.

Then, in the warning is a reference to line 1 char 42. But the markup to 
display is only 32 chars long... What does this mean?

After all I think, that it is a pango problem.

Cheers, detlef