GunChleoc has proposed merging 
lp:~widelands-dev/widelands/bug-1615826-constructionsite-help into lp:widelands.

Commit message:
Constructionsites' help button now points to the help for the building being 
built.

Requested reviews:
  Widelands Developers (widelands-dev)
Related bugs:
  Bug #1615826 in widelands: "Show full encylopedia for buildings under 
construction"
  https://bugs.launchpad.net/widelands/+bug/1615826

For more details, see:
https://code.launchpad.net/~widelands-dev/widelands/bug-1615826-constructionsite-help/+merge/342705
-- 
Your team Widelands Developers is requested to review the proposed merge of 
lp:~widelands-dev/widelands/bug-1615826-constructionsite-help into lp:widelands.
=== modified file 'src/wui/buildingwindow.cc'
--- src/wui/buildingwindow.cc	2017-11-30 13:07:13 +0000
+++ src/wui/buildingwindow.cc	2018-04-05 07:28:01 +0000
@@ -48,11 +48,13 @@
 BuildingWindow::BuildingWindow(InteractiveGameBase& parent,
                                UI::UniqueWindow::Registry& reg,
                                Widelands::Building& b,
+                               const Widelands::BuildingDescr& descr,
                                bool avoid_fastclick)
    : UI::UniqueWindow(&parent, "building_window", &reg, Width, 0, b.descr().descname()),
      is_dying_(false),
      parent_(&parent),
      building_(&b),
+     building_descr_for_help_(descr),
      building_position_(b.get_position()),
      showing_workarea_(false),
      avoid_fastclick_(avoid_fastclick),
@@ -61,6 +63,13 @@
 	   [this](const Widelands::NoteBuilding& note) { on_building_note(note); });
 }
 
+BuildingWindow::BuildingWindow(InteractiveGameBase& parent,
+                               UI::UniqueWindow::Registry& reg,
+                               Widelands::Building& b,
+                               bool avoid_fastclick)
+   : BuildingWindow(parent, reg, b, b.descr(), avoid_fastclick) {
+}
+
 BuildingWindow::~BuildingWindow() {
 	hide_workarea();
 }
@@ -340,7 +349,7 @@
 			if (building_in_lambda == nullptr) {
 				return;
 			}
-			new UI::BuildingHelpWindow(igbase(), registry, building_in_lambda->descr(),
+			new UI::BuildingHelpWindow(igbase(), registry, building_descr_for_help_,
 			                           building_in_lambda->owner().tribe(), &parent_->egbase().lua());
 		};
 

=== modified file 'src/wui/buildingwindow.h'
--- src/wui/buildingwindow.h	2017-12-02 08:04:31 +0000
+++ src/wui/buildingwindow.h	2018-04-05 07:28:01 +0000
@@ -43,6 +43,16 @@
 		Width = 4 * 34  //  4 normally sized buttons
 	};
 
+protected:
+	// This constructor allows setting a building description for the help button independent of the
+	// base building
+	BuildingWindow(InteractiveGameBase& parent,
+	               UI::UniqueWindow::Registry& reg,
+	               Widelands::Building&,
+	               const Widelands::BuildingDescr&,
+	               bool avoid_fastclick);
+
+public:
 	BuildingWindow(InteractiveGameBase& parent,
 	               UI::UniqueWindow::Registry& reg,
 	               Widelands::Building&,
@@ -93,8 +103,12 @@
 
 	InteractiveGameBase* parent_;
 
+	// The building that this window belongs to
 	Widelands::OPtr<Widelands::Building> building_;
 
+	// The building description that will be used for the help button
+	const Widelands::BuildingDescr& building_descr_for_help_;
+
 	// We require this to unregister overlays when we are closed. Since the
 	// building might have been destroyed by then we have to keep a copy of its
 	// position around.

=== modified file 'src/wui/constructionsitewindow.cc'
--- src/wui/constructionsitewindow.cc	2017-12-01 09:17:44 +0000
+++ src/wui/constructionsitewindow.cc	2018-04-05 07:28:01 +0000
@@ -31,7 +31,7 @@
                                                UI::UniqueWindow::Registry& reg,
                                                Widelands::ConstructionSite& cs,
                                                bool avoid_fastclick)
-   : BuildingWindow(parent, reg, cs, avoid_fastclick), construction_site_(&cs), progress_(nullptr) {
+   : BuildingWindow(parent, reg, cs, cs.building(), avoid_fastclick), construction_site_(&cs), progress_(nullptr) {
 	init(avoid_fastclick);
 }
 

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