View.setTranslationY(): queue allocate when called on CoordinatorLayout

androidx adjusts the translation a little bit and immediately
reverts it to trigger a layout pass on the CoordinatorLayout.

Calling gtk_widget_queue_allocate here makes CoordinatorLayout behave
correctly, but it causes strange issues with other Views. Therefore, it is
done only for CoordinatorLayouts for now.

src/api-impl-jni/generated_headers/android_view_View.h

@@ -287,6 +287,14 @@ JNIEXPORT void JNICALL Java_android_view_View_native_1requestLayout
 JNIEXPORT void JNICALL Java_android_view_View_native_1setBackgroundDrawable
   (JNIEnv *, jobject, jlong, jlong);
 
+/*
+ * Class:     android_view_View
+ * Method:    native_queueAllocate
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL Java_android_view_View_native_1queueAllocate
+  (JNIEnv *, jobject, jlong);
+
 /*
  * Class:     android_view_View
  * Method:    nativeInvalidate

src/api-impl-jni/views/android_view_View.c

@@ -536,3 +536,8 @@ JNIEXPORT jboolean JNICALL Java_android_view_View_native_1getMatrix(JNIEnv *env,
 	GtkWidget *widget = gtk_widget_get_parent(GTK_WIDGET(_PTR(widget_ptr)));
 	return gtk_widget_compute_transform(gtk_widget_get_parent(widget), widget, _PTR(matrix_ptr));
 }
+
+JNIEXPORT void JNICALL Java_android_view_View_native_1queueAllocate(JNIEnv *env, jobject this, jlong widget_ptr)
+{
+	gtk_widget_queue_allocate(GTK_WIDGET(_PTR(widget_ptr)));
+}

src/api-impl/android/view/View.java

@@ -948,6 +948,7 @@ public class View extends Object {
 	protected native void native_layout(long widget, int l, int t, int r, int b);
 	protected native void native_requestLayout(long widget);
 	protected native void native_setBackgroundDrawable(long widget, long paintable);
+	protected native void native_queueAllocate(long widget);
 
 	// --- stubs
 
@@ -1379,7 +1380,11 @@ public class View extends Object {
 	public float getTranslationX() {return 0.f;}
 	public float getTranslationY() {return 0.f;}
 	public void setTranslationX(float translationX) {}
-	public void setTranslationY(float translationY) {}
+	public void setTranslationY(float translationY) {
+		// CoordinatorLayout abuses this method to trigger a layout pass
+		if (getClass().getName().equals("androidx.coordinatorlayout.widget.CoordinatorLayout"))
+			native_queueAllocate(widget);
+	}
 
 	public void setAlpha(float alpha) {
 		native_setVisibility(widget, visibility, alpha);