fix bug that prevented markers to appear on fresh plot (e.g. hw tune before data plot)

client/src/proxgui.cpp

@@ -130,6 +130,7 @@ extern "C" void InitGraphics(int argc, char **argv, char *script_cmds_file, char
 #if QT_VERSION >= 0x050100
     qunsetenv("SESSION_MANAGER");
 #endif
+    ClearGraph(false);
     main_loop_thread = new WorkerThread(script_cmds_file, script_cmd, stayInCommandLoop);
     gui = new ProxGuiQT(argc, argv, main_loop_thread);
 }

client/src/proxguiqt.cpp

@@ -1122,13 +1122,6 @@ Plot::Plot(QWidget *parent) : QWidget(parent), g_GraphPixelsPerPoint(1) {
     setPalette(palette);
     setAutoFillBackground(true);
 
-    g_MarkerA.pos = 0;
-    g_MarkerB.pos = 0;
-    g_MarkerC.pos = 0;
-    g_MarkerD.pos = 0;
-    g_GraphStart = 0;
-    g_GraphStop = 0;
-
     setWindowTitle(tr("Sliders"));
     master = parent;
 }