Disable Pango hyphenation when we break words

Related to #1520.

weasyprint/text/ffi.py

@@ -284,6 +284,7 @@
         PangoAttrList *list, PangoAttribute *attr);
     PangoAttribute * pango_attr_font_features_new (const gchar *features);
     PangoAttribute * pango_attr_letter_spacing_new (int letter_spacing);
+    PangoAttribute * pango_attr_insert_hyphens_new (gboolean insert_hyphens);
     void pango_attribute_destroy (PangoAttribute *attr);
 
     PangoTabArray * pango_tab_array_new_with_positions (

weasyprint/text/line_break.py

@@ -212,7 +212,10 @@ def set_text(self, text, justify=False):
         if letter_spacing == 'normal':
             letter_spacing = 0
 
-        if self.text and (word_spacing or letter_spacing):
+        word_breaking = (
+            self.style['overflow_wrap'] in ('anywhere', 'break-word'))
+
+        if self.text and (word_spacing or letter_spacing or word_breaking):
             attr_list = pango.pango_layout_get_attributes(self.layout)
             if not attr_list:
                 # TODO: list should be freed
@@ -236,6 +239,12 @@ def add_attr(start, end, spacing):
                     add_attr(position, position + 1, space_spacing)
                     position = bytestring.find(b' ', position + 1)
 
+            if word_breaking:
+                # TODO: attributes should be freed
+                attr = pango.pango_attr_insert_hyphens_new(False)
+                attr.start_index, attr.end_index = 0, len(bytestring)
+                pango.pango_attr_list_change(attr_list, attr)
+
             pango.pango_layout_set_attributes(self.layout, attr_list)
 
         # Tabs width