Add Ctrl+Click to scroll to plan.

src/lang/english.txt

@@ -4095,7 +4095,7 @@ STR_PLANS_DELETE                                                :{BLACK}Delete
 STR_PLANS_DELETE_TOOLTIP                                        :{BLACK}Delete the selected item in the list
 STR_PLANS_LIST_ITEM_PLAN                                        :Plan #{NUM}: {NUM} line{P "" s} ({DATE_SHORT})
 STR_PLANS_LIST_ITEM_LINE                                        : -- Line #{NUM}: {NUM} segment{P "" s}
-STR_PLANS_LIST_TOOLTIP                                          :{BLACK}Double click any item in the list to (un)fold the related plan
+STR_PLANS_LIST_TOOLTIP                                          :{BLACK}Double click any item in the list to (un)fold the related plan.{}Ctrl+Click to scroll to.
 
 # Vehicle loading indicators
 STR_PERCENT_UP_SMALL                                            :{TINY_FONT}{WHITE}{NUM}%{UP_ARROW}

src/plans_base.h

@@ -131,6 +131,26 @@ struct PlanLine {
 			this->tiles.push_back(FROM_LE32(*data));
 		}
 	}
+
+	void AddLineToCalculateCentreTile(uint64 &x, uint64 &y, uint32 &count) const
+	{
+		for (size_t i = 0; i < this->tiles.size(); i++) {
+			TileIndex t = this->tiles[i];
+			x += TileX(t);
+			y += TileY(t);
+			count++;
+		}
+	}
+
+	TileIndex CalculateCentreTile() const
+	{
+		uint64 x = 0;
+		uint64 y = 0;
+		uint32 count = 0;
+		this->AddLineToCalculateCentreTile(x, y, count);
+		if (count == 0) return INVALID_TILE;
+		return TileXY(x / count, y / count);
+	}
 };
 
 struct Plan : PlanPool::PoolItem<&_plan_pool> {
@@ -229,6 +249,18 @@ struct Plan : PlanPool::PoolItem<&_plan_pool> {
 		if (_current_plan->owner == _local_company) DoCommandP(0, _current_plan->index, !this->visible_by_all, CMD_CHANGE_PLAN_VISIBILITY);
 		return this->visible_by_all;
 	}
+
+	TileIndex CalculateCentreTile() const
+	{
+		uint64 x = 0;
+		uint64 y = 0;
+		uint32 count = 0;
+		for (PlanLineVector::const_iterator it = lines.begin(); it != lines.end(); it++) {
+			(*it)->AddLineToCalculateCentreTile(x, y, count);
+		}
+		if (count == 0) return INVALID_TILE;
+		return TileXY(x / count, y / count);
+	}
 };
 
 #define FOR_ALL_PLANS_FROM(var, start) FOR_ALL_ITEMS_FROM(Plan, plan_index, var, start)

src/plans_gui.cpp

@@ -139,6 +139,18 @@ struct PlansWindow : Window {
 				break;
 			case WID_PLN_LIST: {
 				int new_selected = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_PLN_LIST, WD_FRAMERECT_TOP);
+				if (_ctrl_pressed) {
+					if (new_selected != INT_MAX) {
+						TileIndex t;
+						if (this->list[new_selected].is_plan) {
+							t = Plan::Get(this->list[new_selected].plan_id)->CalculateCentreTile();
+						} else {
+							t = Plan::Get(this->list[new_selected].plan_id)->lines[this->list[new_selected].line_id]->CalculateCentreTile();
+						}
+						if (t != INVALID_TILE) ScrollMainWindowToTile(t);
+					}
+					return;
+				}
 				if (this->selected != INT_MAX) {
 					_current_plan->SetFocus(false);
 				}