Cleanup: Call SetMinimalSize instead of setting min_y directly.

(cherry picked from commit 03a43b8247)

src/widget.cpp

@@ -2337,7 +2337,8 @@ NWidgetLeaf::NWidgetLeaf(WidgetType tp, Colours colour, int index, uint32 data,
 		case WWT_CAPTION:
 			this->SetFill(1, 0);
 			this->SetResize(1, 0);
-			this->min_y = WD_CAPTION_HEIGHT;
+			this->SetMinimalSize(0, WD_CAPTION_HEIGHT);
+			this->SetMinimalTextLines(1, WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM, FS_NORMAL);
 			this->SetDataTip(data, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS);
 			break;
 
@@ -2379,7 +2380,7 @@ NWidgetLeaf::NWidgetLeaf(WidgetType tp, Colours colour, int index, uint32 data,
 
 		case WWT_DROPDOWN:
 			this->SetFill(0, 0);
-			this->min_y = WD_DROPDOWN_HEIGHT;
+			this->SetMinimalSize(0, WD_DROPDOWN_HEIGHT);
 			this->SetAlignment(SA_TOP | SA_LEFT);
 			break;
 

src/widget_type.h

@@ -271,7 +271,7 @@ public:
 	void SetFill(uint fill_x, uint fill_y);
 	void SetResize(uint resize_x, uint resize_y);
 
-	void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl);
+	void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl) override;
 
 	uint min_x; ///< Minimal horizontal size of only this widget.
 	uint min_y; ///< Minimal vertical size of only this widget.
@@ -493,8 +493,8 @@ class NWidgetHorizontal : public NWidgetPIPContainer {
 public:
 	NWidgetHorizontal(NWidContainerFlags flags = NC_NONE);
 
-	void SetupSmallestSize(Window *w, bool init_array);
-	void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl);
+	void SetupSmallestSize(Window *w, bool init_array) override;
+	void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl) override;
 };
 
 /**
@@ -505,7 +505,7 @@ class NWidgetHorizontalLTR : public NWidgetHorizontal {
 public:
 	NWidgetHorizontalLTR(NWidContainerFlags flags = NC_NONE);
 
-	void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl);
+	void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl) override;
 };
 
 /**
@@ -516,8 +516,8 @@ class NWidgetVertical : public NWidgetPIPContainer {
 public:
 	NWidgetVertical(NWidContainerFlags flags = NC_NONE);
 
-	void SetupSmallestSize(Window *w, bool init_array);
-	void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl);
+	void SetupSmallestSize(Window *w, bool init_array) override;
+	void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl) override;
 };
 
 /**