Merge branch 'master' into testing

diff --cc receiver.c
index 932329eb83463074b1d4b62bcc96122bb67e278d,d83198d4e16c7cbc327889454b4439cdde48927a..37c149edf87fbf22dcfee1a1079c5936adc9cbed
--- 1/receiver.c
--- 2/receiver.c
+++ b/receiver.c
@@@ -142,37 -142,27 +142,37 @@@ gboolean receiver_motion_notify_event(G
    int x, y;
    GdkModifierType state;
    RECEIVER *rx=(RECEIVER *)data;
 -  // DL1YCF: if !pressed, we may come from the destruction
 -  //         of a menu, and should not move the VFO.
 -  if(!making_active && pressed) {
 +  //
 +  // if !pressed, we may come from the destruction
 +  // of a menu, and should not move the VFO.
 +  //
 +  if (!making_active && pressed) {
      gdk_window_get_device_position (event->window,
 -                                event->device,
 -                                &x,
 -                                &y,
 -                                &state);
 +                                    event->device,
 +                                    &x,
 +                                    &y,
 +                                    &state);
      //
-     // Sometimes it turned out to be difficult sometimes to "jump" to a
 -    // It turns out to be difficult sometimes to "jump" to a
 -    // frequency by just clicking in the panadaper, since there
 -    // might be a move of zero or one pixel between pressing
 -    // and releasing the mouse button.
 -    // Treat this is a "press/release" event that sets the VFO
 -    // frequency to where we have clicked.
++    // Sometimes it turned out to be difficult to "jump" to a
 +    // new frequency by just clicking in the panadaper. Futher analysis
 +    // showed that there were "moves" with zero offset arriving between
 +    // pressing and releasing the mouse button.
 +    // (In fact, on my Macintosh I see zillions of moves with zero offset)
 +    // Accepting such a "move" between a  "press" and the next "release" event
 +    // sets "has_moved" and results in a "VFO drag" instead of a "VFO set".
 +    //
 +    // So we do the following:
 +    // - "moves" with zero offset are always ignored
 +    // - the first "move" to be accepted after a "press" must lead us
 +    //   at least 2 pixels away from the original position.
      //
      int moved=x-last_x;
 -    if (moved > 1 || moved < -1) {
 -      vfo_move((long long)((float)moved*rx->hz_per_pixel),FALSE);
 -      last_x=x;
 -      has_moved=TRUE;
 +    if (moved) {
 +      if (has_moved || moved < -1 || moved > 1) {
 +        vfo_move((long long)((float)moved*rx->hz_per_pixel),FALSE);
 +        last_x=x;
 +        has_moved=TRUE;
 +      }
      }
    }