Fix several issues in the gestures libraries.

This mostly fixes how gestures libraries are saved and loaded.
Saving a library twice in a row was erasing the entire library,
which was preventing the sketch test app from working propertly.

api/current.xml

@@ -47497,6 +47497,17 @@
  visibility="public"
 >
 </method>
+<method name="hasChanged"
+ return="boolean"
+ abstract="false"
+ native="false"
+ synchronized="false"
+ static="false"
+ final="false"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</method>
 <method name="load"
  return="void"
  abstract="false"

core/java/android/gesture/GestureLibraries.java

@@ -61,17 +61,21 @@ public final class GestureLibraries {
         }
 
         public boolean save() {
-            final File file = mPath;
-            if (!file.canWrite()) return false;
+            if (!mStore.hasChanged()) return true;
 
-            if (!file.getParentFile().exists()) {
-                if (!file.getParentFile().mkdirs()) {
+            final File file = mPath;
+
+            final File parentFile = file.getParentFile();
+            if (!parentFile.exists()) {
+                if (!parentFile.mkdirs()) {
                     return false;
                 }
             }
 
             boolean result = false;
             try {
+                //noinspection ResultOfMethodCallIgnored
+                file.createNewFile();
                 mStore.save(new FileOutputStream(file), true);
                 result = true;
             } catch (FileNotFoundException e) {

core/java/android/gesture/GestureOverlayView.java

@@ -287,8 +287,10 @@ public class GestureOverlayView extends FrameLayout {
         path.computeBounds(bounds, true);
 
         mPath.rewind();
-        mPath.addPath(path, (getWidth() - bounds.width()) / 2.0f,
-                (getHeight() - bounds.height()) / 2.0f);
+        mPath.addPath(path, -bounds.left + (getWidth() - bounds.width()) / 2.0f,
+                -bounds.top + (getHeight() - bounds.height()) / 2.0f);
+
+        mResetGesture = true;
 
         invalidate();
     }
@@ -367,10 +369,10 @@ public class GestureOverlayView extends FrameLayout {
     }
 
     public void clear(boolean animated) {
-        clear(animated, false);
+        clear(animated, false, true);
     }
 
-    private void clear(boolean animated, boolean fireActionPerformed) {
+    private void clear(boolean animated, boolean fireActionPerformed, boolean immediate) {
         setPaintAlpha(255);
         removeCallbacks(mFadingOut);
         mResetGesture = false;
@@ -389,15 +391,19 @@ public class GestureOverlayView extends FrameLayout {
             mIsFadingOut = false;
             mFadingHasStarted = false;
 
-            if (fireActionPerformed) {
-                postDelayed(mFadingOut, mFadeOffset);
-            } else if (mHandleGestureActions) {
+            if (immediate) {
                 mCurrentGesture = null;
                 mPath.rewind();
                 invalidate();
+            } else if (fireActionPerformed) {
+                postDelayed(mFadingOut, mFadeOffset);
             } else if (mGestureStrokeType == GESTURE_STROKE_TYPE_MULTIPLE) {
                 mFadingOut.resetMultipleStrokes = true;
                 postDelayed(mFadingOut, mFadeOffset);
+            } else {
+                mCurrentGesture = null;
+                mPath.rewind();
+                invalidate();
             }
         }
     }
@@ -647,7 +653,8 @@ public class GestureOverlayView extends FrameLayout {
                     listeners.get(i).onGestureEnded(this, event);
                 }
 
-                clear(mHandleGestureActions && mFadeEnabled, mHandleGestureActions && mIsGesturing);
+                clear(mHandleGestureActions && mFadeEnabled, mHandleGestureActions && mIsGesturing,
+                        false);
             } else {
                 cancelGesture(event);
 

core/java/android/gesture/GestureStore.java

@@ -206,6 +206,10 @@ public class GestureStore {
         }
     }
 
+    public boolean hasChanged() {
+        return mChanged;
+    }
+
     /**
      * Save the gesture library
      */
@@ -214,10 +218,6 @@ public class GestureStore {
     }
 
     public void save(OutputStream stream, boolean closeStream) throws IOException {
-        if (!mChanged) {
-            return;
-        }
-
         DataOutputStream out = null;
 
         try {