From 335a1d44d481054d31c1fc5d5acaf16654bcc664 Mon Sep 17 00:00:00 2001
From: Joel Mason <jobba1@hotmail.com>
Date: Fri, 4 Nov 2016 23:31:50 +1100
Subject: [PATCH] Adds preserve to signal created by manipulate

Stops issues with manipulate signals being garbage collected when they go out of scope.
Fixes #115
---
 src/manipulate.jl | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/manipulate.jl b/src/manipulate.jl
index 948df64..ffd470c 100644
--- a/src/manipulate.jl
+++ b/src/manipulate.jl
@@ -16,7 +16,7 @@ end
 function map_block(block, symbols)
     lambda = Expr(:(->), Expr(:tuple, symbols...),
                   block)
-    :(map($lambda, $(map(s->:(signal($s)), symbols)...), typ=Any))
+    :(preserve(map($lambda, $(map(s->:(signal($s)), symbols)...), typ=Any)))
 end
 
 function symbols(bindings)
@@ -36,7 +36,7 @@ macro manipulate(expr)
     end
     syms = symbols(bindings)
     Expr(:let, Expr(:block,
-                    display_widgets(syms)...,
-                    esc(map_block(block, syms))),
-         map(make_widget, bindings)...)
+                        display_widgets(syms)...,
+                        esc(map_block(block, syms))),
+            map(make_widget, bindings)...)
 end