Make status bar expanding more tightly coupled to finger

Improves the "direct modification" feeling a bit.

Bug: 17040206
Change-Id: Ide4bfb36aef584da36e0340bc2ed099e2e24c0ee

packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelView.java

@@ -284,7 +284,7 @@ public abstract class PanelView extends FrameLayout {
                                 || mInitialOffsetOnTouch == 0f)) {
                     mTouchSlopExceeded = true;
                     if (waitForTouchSlop && !mTracking) {
-                        if (!mJustPeeked) {
+                        if (!mJustPeeked && mInitialOffsetOnTouch != 0f) {
                             mInitialOffsetOnTouch = mExpandedHeight;
                             mInitialTouchX = x;
                             mInitialTouchY = y;