DecodeTrace: Make an empty decode trace appear symmetrical

diff --git a/pv/view/decodetrace.cpp b/pv/view/decodetrace.cpp
index ab9514cd4e4da34e706c522ecb4244a123a38ad9..20de3755be482688be6cc2ce4f28220c2bd84f5c 100644 (file)
--- a/pv/view/decodetrace.cpp
+++ b/pv/view/decodetrace.cpp
@@ -169,7 +169,10 @@ pair<int, int> DecodeTrace::v_extents() const
 {
        const int row_height = (ViewItemPaintParams::text_height() * 6) / 4;
 
-       return make_pair(-row_height, row_height * max_visible_rows_);
+       // Make an empty decode trace appear symmetrical
+       const int row_count = max(1, max_visible_rows_);
+
+       return make_pair(-row_height, row_height * row_count);
 }
 
 void DecodeTrace::paint_back(QPainter &p, const ViewItemPaintParams &pp)