center watch button sprite in toolbar

src/road_gui.cpp

@@ -548,6 +548,7 @@ struct BuildRoadToolbarWindow : Window {
 
 			case WID_ROT_FULLROAD:
 				HandlePlacePushButton(this, WID_ROT_FULLROAD, _road_type_infos[_cur_roadtype].cursor_autoroad, HT_RECT);
+				// IConsolePrintF(CC_WARNING, "WARNING! Full-tile autoroad tool is deprecated and will be removed in next release.");
 				this->last_started_action = widget;
 				break;
 

src/toolbar_gui.cpp

@@ -1778,6 +1778,14 @@ struct MainToolbarWindow : Window {
 		this->DrawWidgets();
 	}
 
+	virtual void DrawWidget(const Rect &r, int widget) const {
+		if (widget == WID_TN_WATCH) {
+			Dimension d = GetSpriteSize(SPR_CENTRE_VIEW_VEHICLE);
+			uint offset = this->IsWidgetLowered(WID_TN_WATCH) ? 1 : 0;
+			DrawSprite(SPR_CENTRE_VIEW_VEHICLE, PAL_NONE, (r.left + r.right - d.width) / 2 + offset, (r.top + r.bottom - d.height) / 2 + offset);
+		}
+	}
+
 	virtual void OnClick(Point pt, int widget, int click_count)
 	{
 		if (_game_mode != GM_MENU && !this->IsWidgetDisabled(widget)) _toolbar_button_procs[widget](this);
@@ -2006,7 +2014,7 @@ static NWidgetBase *MakeMainToolbar(int *biggest_index)
 		SPR_IMG_COMPANY_GENERAL, // WID_TN_COMPANIES
 		SPR_IMG_STORY_BOOK,      // WID_TN_STORY
 		SPR_IMG_GOAL,            // WID_TN_GOAL
-		SPR_CENTRE_VIEW_VEHICLE, // WID_TN_WATCH
+		0,                       // WID_TN_WATCH
 		SPR_IMG_GRAPHS,          // WID_TN_GRAPHS
 		SPR_IMG_COMPANY_LEAGUE,  // WID_TN_LEAGUE
 		SPR_IMG_INDUSTRY,        // WID_TN_INDUSTRIES

src/widget.cpp

@@ -217,8 +217,9 @@ void DrawFrameRect(int left, int top, int right, int bottom, Colours colour, Fra
  */
 static inline void DrawImageButtons(const Rect &r, WidgetType type, Colours colour, bool clicked, SpriteID img)
 {
-	assert(img != 0);
+
 	DrawFrameRect(r.left, r.top, r.right, r.bottom, colour, (clicked) ? FR_LOWERED : FR_NONE);
+	if (img == 0) return;
 
 	if ((type & WWT_MASK) == WWT_IMGBTN_2 && clicked) img++; // Show different image when clicked for #WWT_IMGBTN_2.
 	DrawSprite(img, PAL_NONE, r.left + WD_IMGBTN_LEFT + clicked, r.top + WD_IMGBTN_TOP + clicked);