DecodeTrace: Make sure first row's label width can be calculated

Without a pen set, p.boundingRect() returns 0. All other rows
have their label text width calculated with a pen, which makes
p.boundingRect() work as intended. Fix this by setting a pen
before the first row is processed.

diff --git a/pv/view/decodetrace.cpp b/pv/view/decodetrace.cpp
index 20de3755be482688be6cc2ce4f28220c2bd84f5c..9e41bc4ac1f515f0a457ce2bff384820b040447e 100644 (file)
--- a/pv/view/decodetrace.cpp
+++ b/pv/view/decodetrace.cpp
@@ -198,6 +198,9 @@ void DecodeTrace::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
                return;
        }
 
+       // Set default pen to allow for text width calculation
+       p.setPen(Qt::black);
+
        // Iterate through the rows
        int y = get_visual_y();
        pair<uint64_t, uint64_t> sample_range = get_sample_range(