AnalogSignal: Set initial value for the "value at cursor" variable

Without this, the analog traces show random values after startup
until the mouse cursor enters the application window and the cursor
position updates.

diff --git a/pv/views/trace/analogsignal.cpp b/pv/views/trace/analogsignal.cpp
index 0994d92ed0eba4e30484abc79af17f8fec9512b0..ac5e83c834880f4e85f5f9fd2c8203ebf017301b 100644 (file)
--- a/pv/views/trace/analogsignal.cpp
+++ b/pv/views/trace/analogsignal.cpp
@@ -109,7 +109,8 @@ AnalogSignal::AnalogSignal(
        neg_vdivs_(1),
        resolution_(0),
        display_type_(DisplayBoth),
-       autoranging_(true)
+       autoranging_(true),
+       value_at_hover_pos_(std::numeric_limits<float>::quiet_NaN())
 {
        axis_pen_ = AxisPen;