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-rw-r--r--libs/canvas/rectangle.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/libs/canvas/rectangle.cc b/libs/canvas/rectangle.cc
index d5808b9bb0..4c5304aafd 100644
--- a/libs/canvas/rectangle.cc
+++ b/libs/canvas/rectangle.cc
@@ -55,7 +55,9 @@ Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) con
boost::optional<Rect> r = self.intersection (area);
if (!r) {
+#ifdef CANVAS_DEBUG
std::cerr << whatami() << '/' << name << " not covered by render area! ... " << self << " vs. " << area << std::endl;
+#endif
return;
}