Fix viewport tooltips not being cleared when scrolling using the keyboard.

Fix documentation typo.

src/misc_gui.cpp

@@ -26,6 +26,7 @@
 #include "core/geometry_func.hpp"
 #include "newgrf_debug.h"
 #include "zoom_func.h"
+#include "viewport_type.h"
 
 #include "widgets/misc_widget.h"
 
@@ -652,6 +653,9 @@ struct TooltipsWindow : public Window
 	uint64 params[5];                 ///< The string parameters.
 	TooltipCloseCondition close_cond; ///< Condition for closing the window.
 	char buffer[DRAW_STRING_BUFFER];  ///< Text to draw
+	int viewport_virtual_left;        ///< Owner viewport state: left
+	int viewport_virtual_top;         ///< Owner viewport state: top
+	bool delete_next_mouse_loop;      ///< Delete window on the next mouse loop
 
 	TooltipsWindow(Window *parent, StringID str, uint paramcount, const uint64 params[], TooltipCloseCondition close_tooltip) : Window(&_tool_tips_desc)
 	{
@@ -662,7 +666,12 @@ struct TooltipsWindow : public Window
 		memcpy(this->params, params, sizeof(this->params[0]) * paramcount);
 		this->paramcount = paramcount;
 		this->close_cond = close_tooltip;
+		this->delete_next_mouse_loop = false;
 		if (this->paramcount == 0) GetString(this->buffer, str, lastof(this->buffer)); // Get the text while params are available
+		if (close_tooltip == TCC_HOVER_VIEWPORT) {
+			this->viewport_virtual_left = parent->viewport->virtual_left;
+			this->viewport_virtual_top = parent->viewport->virtual_top;
+		}
 
 		this->InitNested();
 
@@ -721,7 +730,7 @@ struct TooltipsWindow : public Window
 	virtual void OnMouseLoop()
 	{
 		/* Always close tooltips when the cursor is not in our window. */
-		if (!_cursor.in_window) {
+		if (!_cursor.in_window || this->delete_next_mouse_loop) {
 			delete this;
 			return;
 		}
@@ -732,6 +741,17 @@ struct TooltipsWindow : public Window
 			case TCC_RIGHT_CLICK: if (!_right_button_down) delete this; break;
 			case TCC_LEFT_CLICK: if (!_left_button_down) delete this; break;
 			case TCC_HOVER: if (!_mouse_hovering) delete this; break;
+
+			case TCC_HOVER_VIEWPORT:
+				if (!_mouse_hovering) {
+					delete this;
+					break;
+				}
+				if (this->viewport_virtual_left != this->parent->viewport->virtual_left ||
+						this->viewport_virtual_top != this->parent->viewport->virtual_top) {
+					this->delete_next_mouse_loop = true;
+				}
+				break;
 		}
 	}
 };

src/viewport_gui.cpp

@@ -217,7 +217,7 @@ void ShowTooltipForTile(Window *w, const TileIndex tile)
 		case MP_HOUSE: {
 			if (HasBit(_display_opt, DO_SHOW_TOWN_NAMES)) return; // No need for a town name tooltip when it is already displayed
 			SetDParam(0, GetTownIndex(tile));
-			GuiShowTooltips(w, STR_TOWN_NAME_TOOLTIP, 0, NULL, TCC_HOVER);
+			GuiShowTooltips(w, STR_TOWN_NAME_TOOLTIP, 0, NULL, TCC_HOVER_VIEWPORT);
 			break;
 		}
 		case MP_INDUSTRY: {
@@ -235,7 +235,7 @@ void ShowTooltipForTile(Window *w, const TileIndex tile)
 					str++;
 				}
 			}
-			GuiShowTooltips(w, str, 0, NULL, TCC_HOVER);
+			GuiShowTooltips(w, str, 0, NULL, TCC_HOVER_VIEWPORT);
 			break;
 		}
 		default:

src/viewport_type.h

@@ -33,7 +33,7 @@ enum ViewportMapType {
  * Data structure for viewport, display of a part of the world
  */
 struct ViewPort {
-	int left;    ///< Screen coordinate left egde of the viewport
+	int left;    ///< Screen coordinate left edge of the viewport
 	int top;     ///< Screen coordinate top edge of the viewport
 	int width;   ///< Screen width of the viewport
 	int height;  ///< Screen height of the viewport

src/window_gui.h

@@ -871,6 +871,7 @@ enum TooltipCloseCondition {
 	TCC_RIGHT_CLICK,
 	TCC_LEFT_CLICK,
 	TCC_HOVER,
+	TCC_HOVER_VIEWPORT,
 };
 
 void GuiShowTooltips(Window *parent, StringID str, uint paramcount = 0, const uint64 params[] = NULL, TooltipCloseCondition close_tooltip = TCC_HOVER);