Erase queued commands when another command is about to be queued.

src/airport_gui.cpp

@@ -103,6 +103,7 @@ struct BuildAirToolbarWindow : Window {
 
 	virtual void OnPlaceObject(Point pt, TileIndex tile)
 	{
+		EraseQueuedTouchCommand();
 		switch (this->last_user_action) {
 			case WID_AT_AIRPORT: {
 				VpStartPlaceSizing(tile, VPM_SINGLE_TILE, DDSP_BUILD_STATION);

src/dock_gui.cpp

@@ -168,6 +168,7 @@ struct BuildDocksToolbarWindow : Window {
 
 	virtual void OnPlaceObject(Point pt, TileIndex tile)
 	{
+		EraseQueuedTouchCommand();
 		switch (this->last_clicked_widget) {
 			case WID_DT_CANAL: // Build canal button
 				VpStartPlaceSizing(tile, (_game_mode == GM_EDITOR) ? VPM_X_AND_Y : VPM_X_OR_Y, DDSP_CREATE_WATER);

src/rail_gui.cpp

@@ -583,6 +583,7 @@ struct BuildRailToolbarWindow : Window {
 
 	virtual void OnPlaceObject(Point pt, TileIndex tile)
 	{
+		EraseQueuedTouchCommand();
 		switch (this->last_user_action) {
 			case WID_RAT_BUILD_NS:
 				VpStartPlaceSizing(tile, VPM_FIX_VERTICAL | VPM_RAILDIRS, DDSP_PLACE_RAIL);

src/road_gui.cpp

@@ -467,6 +467,7 @@ struct BuildRoadToolbarWindow : Window {
 
 	virtual void OnPlaceObject(Point pt, TileIndex tile)
 	{
+		EraseQueuedTouchCommand();
 		_remove_button_clicked = this->IsWidgetLowered(WID_ROT_REMOVE);
 		_one_way_button_clicked = this->IsWidgetLowered(WID_ROT_ONE_WAY);
 		switch (this->last_started_action) {

src/terraform_gui.cpp

@@ -655,6 +655,7 @@ struct ScenarioEditorLandscapeGenerationWindow : Window {
 
 	virtual void OnPlaceObject(Point pt, TileIndex tile)
 	{
+		EraseQueuedTouchCommand();
 		switch (this->last_user_action) {
 			case WID_ETT_DEMOLISH: // Demolish aka dynamite button
 				PlaceProc_DemolishArea(tile);

src/tree_gui.cpp

@@ -149,6 +149,7 @@ public:
 
 	virtual void OnPlaceObject(Point pt, TileIndex tile)
 	{
+		EraseQueuedTouchCommand();
 		VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_PLANT_TREES);
 	}