# HG changeset patch
# User adf88@interia.pl
# Date 1503136274 -7200
#      Sat Aug 19 11:51:14 2017 +0200
# Branch trunk
# Node ID a42ef8646911e21397cfdbb4611667ec2fee3ade
# Parent  584e1cc2ffb25cb095e7ffa701d23530d5d10ea5
Fixes the issue (disables/enables the button when needed).

diff -r 584e1cc2ffb2 -r a42ef8646911 src/build_vehicle_gui.cpp
--- a/src/build_vehicle_gui.cpp	Sun Aug 13 18:38:42 2017 +0000
+++ b/src/build_vehicle_gui.cpp	Sat Aug 19 11:51:14 2017 +0200
@@ -1439,6 +1439,7 @@
 		this->vscroll->SetCount(this->eng_list.Length());
 
 		this->SetWidgetDisabledState(WID_BV_SHOW_HIDE, this->sel_engine == INVALID_ENGINE);
+		this->SetWidgetDisabledState(WID_BV_BUILD, this->sel_engine == INVALID_ENGINE);
 
 		this->DrawWidgets();