From 10ea210d057b97ed8bec1738e2e034d22ca48ac5 Mon Sep 17 00:00:00 2001
From: Mike Bostock <mbostock@gmail.com>
Date: Tue, 12 May 2020 13:14:23 -0700
Subject: [PATCH] Only orphan mouse gestures.

This avoids orphaning a programmatic brush transition.
---
 src/brush.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/brush.js b/src/brush.js
index 32a5f7b..4ca0ae3 100644
--- a/src/brush.js
+++ b/src/brush.js
@@ -288,14 +288,16 @@ function brush(dim) {
   }
 
   function emitter(that, args, clean) {
-    return (!clean && that.__brush.emitter) || new Emitter(that, args);
+    var emit = that.__brush.emitter;
+    return emit && (!clean || !emit.clean) ? emit : new Emitter(that, args, clean);
   }
 
-  function Emitter(that, args) {
+  function Emitter(that, args, clean) {
     this.that = that;
     this.args = args;
     this.state = that.__brush;
     this.active = 0;
+    this.clean = clean;
   }
 
   Emitter.prototype = {