Amend gui's to work with touchscreen controls.

src/airport_gui.cpp

@@ -77,6 +77,7 @@ struct BuildAirToolbarWindow : Window {
 
 	~BuildAirToolbarWindow()
 	{
+		if (_thd.GetCallbackWnd() == this) this->OnPlaceObjectAbort();
 		if (_settings_client.gui.link_terraform_toolbar) DeleteWindowById(WC_SCEN_LAND_GEN, 0, false);
 	}
 
@@ -141,6 +142,8 @@ struct BuildAirToolbarWindow : Window {
 
 		DeleteWindowById(WC_BUILD_STATION, TRANSPORT_AIR);
 		DeleteWindowById(WC_SELECT_STATION, 0);
+
+		ResetObjectToPlace();
 	}
 
 	static HotkeyList hotkeys;

src/industry_gui.cpp

@@ -279,6 +279,10 @@ public:
 		this->SetButtons();
 	}
 
+	~BuildIndustryWindow() {
+		if (_thd.GetCallbackWnd() == this) this->OnPlaceObjectAbort();
+	}
+
 	virtual void OnInit()
 	{
 		this->SetupArrays();

src/terraform_gui.cpp

@@ -158,6 +158,7 @@ struct TerraformToolbarWindow : Window {
 
 	~TerraformToolbarWindow()
 	{
+		if (_thd.GetCallbackWnd() == this) this->OnPlaceObjectAbort();
 	}
 
 	virtual void OnInit()
@@ -287,6 +288,7 @@ struct TerraformToolbarWindow : Window {
 	{
 		DeleteWindowById(WC_BUILD_OBJECT, 0);
 		this->RaiseButtons();
+		ResetObjectToPlace();
 	}
 
 	static HotkeyList hotkeys;

src/town_gui.cpp

@@ -1061,6 +1061,10 @@ public:
 		this->UpdateButtons(true);
 	}
 
+	~FoundTownWindow() {
+		if (_thd.GetCallbackWnd() == this) this->OnPlaceObjectAbort();
+	}
+
 	void RandomTownName()
 	{
 		this->townnamevalid = GenerateTownName(&this->townnameparts);

src/tree_gui.cpp

@@ -18,6 +18,7 @@
 #include "command_func.h"
 #include "sound_func.h"
 #include "tree_map.h"
+#include "window_func.h"
 
 #include "widgets/tree_widget.h"
 
@@ -58,6 +59,11 @@ public:
 		ResetObjectToPlace();
 	}
 
+	~BuildTreesWindow()
+	{
+		if (_thd.GetCallbackWnd() == this) this->OnPlaceObjectAbort();
+	}
+
 	/**
 	 * Calculate the maximum size of all tree sprites
 	 * @return Dimension of the largest tree sprite
@@ -171,6 +177,8 @@ public:
 	virtual void OnPlaceObjectAbort()
 	{
 		this->RaiseButtons();
+
+		ResetObjectToPlace();
 	}
 };