Cherry-pick animation fix for 4.2

scene/animation/animation_blend_space_1d.cpp

@@ -273,7 +273,7 @@ void AnimationNodeBlendSpace1D::_add_blend_point(int p_index, const Ref<Animatio
 }
 
 double AnimationNodeBlendSpace1D::_process(const AnimationMixer::PlaybackInfo p_playback_info, bool p_test_only) {
-	if (blend_points_used == 0) {
+	if (!blend_points_used) {
 		return 0.0;
 	}
 

scene/animation/animation_blend_space_2d.cpp

@@ -445,6 +445,10 @@ void AnimationNodeBlendSpace2D::_blend_triangle(const Vector2 &p_pos, const Vect
 double AnimationNodeBlendSpace2D::_process(const AnimationMixer::PlaybackInfo p_playback_info, bool p_test_only) {
 	_update_triangles();
 
+	if (!blend_points_used) {
+		return 0;
+	}
+
 	Vector2 blend_pos = get_parameter(blend_position);
 	int cur_closest = get_parameter(closest);
 	double cur_length_internal = get_parameter(length_internal);
@@ -453,7 +457,7 @@ double AnimationNodeBlendSpace2D::_process(const AnimationMixer::PlaybackInfo p_
 	AnimationMixer::PlaybackInfo pi = p_playback_info;
 
 	if (blend_mode == BLEND_MODE_INTERPOLATED) {
-		if (triangles.size() == 0) {
+		if (triangles.is_empty()) {
 			return 0;
 		}
 

scene/animation/animation_mixer.cpp

@@ -1572,7 +1572,7 @@ void AnimationMixer::_blend_process(double p_delta, bool p_update_only) {
 					}
 					if (seeked) {
 						// Seek.
-						int idx = a->track_find_key(i, time, is_external_seeking ? Animation::FIND_MODE_NEAREST : Animation::FIND_MODE_EXACT);
+						int idx = a->track_find_key(i, time, Animation::FIND_MODE_NEAREST);
 						if (idx < 0) {
 							continue;
 						}
@@ -1585,6 +1585,9 @@ void AnimationMixer::_blend_process(double p_delta, bool p_update_only) {
 						double at_anim_pos = 0.0;
 						switch (anim->get_loop_mode()) {
 							case Animation::LOOP_NONE: {
+								if (!is_external_seeking && ((!backward && time >= pos + (double)anim->get_length()) || (backward && time <= pos))) {
+									continue; // Do nothing if current time is outside of length when started.
+								}
 								at_anim_pos = MIN((double)anim->get_length(), time - pos); // Seek to end.
 							} break;
 							case Animation::LOOP_LINEAR: {
@@ -1596,7 +1599,7 @@ void AnimationMixer::_blend_process(double p_delta, bool p_update_only) {
 							default:
 								break;
 						}
-						if (player2->is_playing()) {
+						if (player2->is_playing() || !is_external_seeking) {
 							player2->seek(at_anim_pos, false, p_update_only);
 							player2->play(anim_name);
 							t->playing = true;

scene/animation/animation_player.cpp

@@ -149,7 +149,7 @@ void AnimationPlayer::_notification(int p_what) {
 	switch (p_what) {
 		case NOTIFICATION_READY: {
 			if (!Engine::get_singleton()->is_editor_hint() && animation_set.has(autoplay)) {
-				set_active(true);
+				set_active(active);
 				play(autoplay);
 				_check_immediately_after_start();
 			}

scene/gui/control.cpp

@@ -1397,6 +1397,15 @@ void Control::_set_position(const Point2 &p_point) {
 
 void Control::set_position(const Point2 &p_point, bool p_keep_offsets) {
 	ERR_MAIN_THREAD_GUARD;
+
+#ifdef TOOLS_ENABLED
+	// Can't compute anchors, set position directly and return immediately.
+	if (saving && !is_inside_tree()) {
+		data.pos_cache = p_point;
+		return;
+	}
+#endif
+
 	if (p_keep_offsets) {
 		_compute_anchors(Rect2(p_point, data.size_cache), data.offset, data.anchor);
 	} else {
@@ -1457,6 +1466,14 @@ void Control::set_size(const Size2 &p_size, bool p_keep_offsets) {
 		new_size.y = min.y;
 	}
 
+#ifdef TOOLS_ENABLED
+	// Can't compute anchors, set size directly and return immediately.
+	if (saving && !is_inside_tree()) {
+		data.size_cache = new_size;
+		return;
+	}
+#endif
+
 	if (p_keep_offsets) {
 		_compute_anchors(Rect2(data.pos_cache, new_size), data.offset, data.anchor);
 	} else {
@@ -3135,6 +3152,14 @@ Control *Control::make_custom_tooltip(const String &p_text) const {
 void Control::_notification(int p_notification) {
 	ERR_MAIN_THREAD_GUARD;
 	switch (p_notification) {
+#ifdef TOOLS_ENABLED
+		case NOTIFICATION_EDITOR_PRE_SAVE: {
+			saving = true;
+		} break;
+		case NOTIFICATION_EDITOR_POST_SAVE: {
+			saving = false;
+		} break;
+#endif
 		case NOTIFICATION_POSTINITIALIZE: {
 			data.initialized = true;
 

scene/gui/control.h

@@ -47,6 +47,10 @@ class ThemeContext;
 class Control : public CanvasItem {
 	GDCLASS(Control, CanvasItem);
 
+#ifdef TOOLS_ENABLED
+	bool saving = false;
+#endif
+
 public:
 	enum Anchor {
 		ANCHOR_BEGIN = 0,