Debug: Add auto-refresh functionality to the debug window

src/lang/english.txt

@@ -3659,6 +3659,8 @@ STR_NEWGRF_PARAMETERS_NUM_PARAM                                 :{LTBLUE}Number
 STR_NEWGRF_INSPECT_CAPTION                                      :{WHITE}Inspect - {STRING5}
 STR_NEWGRF_INSPECT_PARENT_BUTTON                                :{BLACK}Parent
 STR_NEWGRF_INSPECT_PARENT_TOOLTIP                               :{BLACK}Inspect the object of the parent scope
+STR_NEWGRF_INSPECT_REFRESH                                      :{BLACK}R
+STR_NEWGRF_INSPECT_REFRESH_TOOLTIP                              :{BLACK}Toggle whether to refresh the contents every frame
 
 STR_NEWGRF_INSPECT_CAPTION_OBJECT_AT                            :{STRING1} at {HEX}
 STR_NEWGRF_INSPECT_CAPTION_OBJECT_AT_OBJECT                     :Object

src/newgrf_debug_gui.cpp

@@ -298,6 +298,8 @@ struct NewGRFInspectWindow : Window {
 
 	int first_variable_line_index = 0;
 
+	bool auto_refresh = false;
+
 	/**
 	 * Check whether the given variable has a parameter.
 	 * @param variable the variable to check.
@@ -628,6 +630,13 @@ struct NewGRFInspectWindow : Window {
 					this->current_edit_param = niv->var;
 					ShowQueryString(STR_EMPTY, STR_NEWGRF_INSPECT_QUERY_CAPTION, 9, this, CS_HEXADECIMAL, QSF_NONE);
 				}
+				break;
+			}
+
+			case WID_NGRFI_REFRESH: {
+				this->auto_refresh = !this->auto_refresh;
+				this->SetWidgetLoweredState(WID_NGRFI_REFRESH, this->auto_refresh);
+				break;
 			}
 		}
 	}
@@ -660,6 +669,11 @@ struct NewGRFInspectWindow : Window {
 			this->SetWidgetDisabledState(WID_NGRFI_VEH_NEXT, v == nullptr || v->Next() == nullptr);
 		}
 	}
+
+	void OnRealtimeTick(uint delta_ms) override
+	{
+		if (this->auto_refresh) this->SetDirty();
+	}
 };
 
 /* static */ uint32 NewGRFInspectWindow::var60params[GSF_FAKE_END][0x20] = { {0} }; // Use spec to have 0s in whole array
@@ -668,6 +682,7 @@ static const NWidgetPart _nested_newgrf_inspect_chain_widgets[] = {
 	NWidget(NWID_HORIZONTAL),
 		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
 		NWidget(WWT_CAPTION, COLOUR_GREY, WID_NGRFI_CAPTION), SetDataTip(STR_NEWGRF_INSPECT_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
+		NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_NGRFI_REFRESH), SetDataTip(STR_NEWGRF_INSPECT_REFRESH, STR_NEWGRF_INSPECT_REFRESH_TOOLTIP),
 		NWidget(WWT_SHADEBOX, COLOUR_GREY),
 		NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
 		NWidget(WWT_STICKYBOX, COLOUR_GREY),
@@ -693,6 +708,7 @@ static const NWidgetPart _nested_newgrf_inspect_widgets[] = {
 		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
 		NWidget(WWT_CAPTION, COLOUR_GREY, WID_NGRFI_CAPTION), SetDataTip(STR_NEWGRF_INSPECT_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
 		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_NGRFI_PARENT), SetDataTip(STR_NEWGRF_INSPECT_PARENT_BUTTON, STR_NEWGRF_INSPECT_PARENT_TOOLTIP),
+		NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_NGRFI_REFRESH), SetDataTip(STR_NEWGRF_INSPECT_REFRESH, STR_NEWGRF_INSPECT_REFRESH_TOOLTIP),
 		NWidget(WWT_SHADEBOX, COLOUR_GREY),
 		NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
 		NWidget(WWT_STICKYBOX, COLOUR_GREY),

src/widgets/newgrf_debug_widget.h

@@ -19,6 +19,7 @@ enum NewGRFInspectWidgets {
 	WID_NGRFI_VEH_CHAIN, ///< Display for vehicle chain.
 	WID_NGRFI_MAINPANEL, ///< Panel widget containing the actual data.
 	WID_NGRFI_SCROLLBAR, ///< Scrollbar.
+	WID_NGRFI_REFRESH,   ///< Refresh toggle.
 };
 
 /** Widgets of the #SpriteAlignerWindow class. */