Display: always draw the map in the full window

This is a temporary measure that removes reliance on the theme map rect.
I need to ponder the best design to handle displaying the full map.

src/display.cpp

@@ -497,6 +497,11 @@ const SDL_Rect& display::map_area() const
 	return res;
 }
 
+const SDL_Rect display::map_outside_area() const
+{
+	return map_screenshot_ ? max_map_area() : video_.screen_area();
+}
+
 bool display::outside_area(const SDL_Rect& area, const int x, const int y)
 {
 	const int x_thresh = hex_size();
@@ -616,6 +621,11 @@ const rect_of_hexes display::hexes_under_rect(const SDL_Rect& r) const
 	return res;
 }
 
+const rect_of_hexes display::get_visible_hexes() const
+{
+	return hexes_under_rect(map_area());
+}
+
 bool display::team_valid() const
 {
 	return currentTeam_ < dc_->teams().size();
@@ -1551,7 +1561,7 @@ const map_labels& display::labels() const
 	return *map_labels_;
 }
 
-const SDL_Rect& display::get_clip_rect()
+const SDL_Rect display::get_clip_rect()
 {
 	return map_area();
 }

src/display.hpp

@@ -298,10 +298,7 @@ class display : public events::sdl_handler
 	 * Returns the available area for a map, this may differ from the above.
 	 * This area will get the background area applied to it.
 	 */
-	const SDL_Rect& map_outside_area() const
-	{
-		return map_screenshot_ ? max_map_area() : theme_.main_map_location(video_.screen_area());
-	}
+	const SDL_Rect map_outside_area() const;
 
 	/** Check if the bbox of the hex at x,y has pixels outside the area rectangle. */
 	static bool outside_area(const SDL_Rect& area, const int x, const int y);
@@ -383,10 +380,7 @@ class display : public events::sdl_handler
 	const rect_of_hexes hexes_under_rect(const SDL_Rect& r) const;
 
 	/** Returns the rectangular area of visible hexes */
-	const rect_of_hexes get_visible_hexes() const
-	{
-		return hexes_under_rect(map_area());
-	}
+	const rect_of_hexes get_visible_hexes() const;
 
 	/** Returns true if location (x,y) is covered in shroud. */
 	bool shrouded(const map_location& loc) const;
@@ -864,7 +858,7 @@ class display : public events::sdl_handler
 	 * Get the clipping rectangle for drawing.
 	 * Virtual since the editor might use a slightly different approach.
 	 */
-	virtual const SDL_Rect& get_clip_rect();
+	virtual const SDL_Rect get_clip_rect();
 
 	/** Draw the appropriate fog or shroud transition images for a specific hex. */
 	void draw_fog_shroud_transition_images(const map_location& loc, image::TYPE image_type);

src/editor/editor_display.cpp

@@ -99,7 +99,7 @@ void editor_display::draw_hex_overlays()
 	}
 }
 
-const SDL_Rect& editor_display::get_clip_rect()
+const SDL_Rect editor_display::get_clip_rect()
 {
 	return map_outside_area();
 }

src/editor/editor_display.hpp

@@ -51,7 +51,7 @@ class editor_display : public display
 	virtual void draw_hex_cursor(const map_location& loc) override;
 	virtual void draw_hex_overlays() override;
 
-	const SDL_Rect& get_clip_rect() override;
+	const SDL_Rect get_clip_rect() override;
 
 	std::set<map_location> brush_locations_;