From 9cb17d7af8c9e49bc7baee2e70144490d6548b1d Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Fri, 8 Jun 2018 13:42:04 -0300
Subject: [PATCH] Avoid animation length from ever being completely, fixes
 #19420

---
 editor/animation_track_editor.cpp | 4 +++-
 scene/resources/animation.cpp     | 6 +++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/editor/animation_track_editor.cpp b/editor/animation_track_editor.cpp
index adc9821d8a6..d8b90bb8dba 100644
--- a/editor/animation_track_editor.cpp
+++ b/editor/animation_track_editor.cpp
@@ -643,6 +643,8 @@ void AnimationTimelineEdit::_anim_length_changed(double p_new_len) {
 	if (editing)
 		return;
 
+	p_new_len = MAX(0.001, p_new_len);
+
 	editing = true;
 	*block_animation_update_ptr = true;
 	undo_redo->create_action("Change animation length");
@@ -1059,7 +1061,7 @@ AnimationTimelineEdit::AnimationTimelineEdit() {
 	time_icon->set_tooltip(TTR("Animation Length Time (seconds)"));
 	len_hb->add_child(time_icon);
 	length = memnew(EditorSpinSlider);
-	length->set_min(0);
+	length->set_min(0.001);
 	length->set_max(3600);
 	length->set_step(0.01);
 	length->set_allow_greater(true);
diff --git a/scene/resources/animation.cpp b/scene/resources/animation.cpp
index 9c95cba357e..fe4d687c231 100644
--- a/scene/resources/animation.cpp
+++ b/scene/resources/animation.cpp
@@ -32,6 +32,8 @@
 
 #include "geometry.h"
 
+#define ANIM_MIN_LENGTH 0.001
+
 bool Animation::_set(const StringName &p_name, const Variant &p_value) {
 
 	String name = p_name;
@@ -2524,7 +2526,9 @@ StringName Animation::animation_track_get_key_animation(int p_track, int p_key)
 
 void Animation::set_length(float p_length) {
 
-	ERR_FAIL_COND(length < 0);
+	if (p_length < ANIM_MIN_LENGTH) {
+		p_length = ANIM_MIN_LENGTH;
+	}
 	length = p_length;
 	emit_changed();
 }