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Bug 135683 – Cache glyphstring extents
+ Cache line extents. This avoids the final pango_font_get_glyph_extents()
+ call per glyph per layout rendering. Now we don't make any
+ pango_font_get_glyph_extents() calls when rendering a layout (some
+ conditions apply).
+
* pango/pango-layout.c (pango_layout_get_lines),
(pango_layout_get_line), (pango_layout_line_leaked),
(pango_layout_line_get_extents), (pango_layout_line_new),