Codechange: Spell 'Viewport' consistently

Some places in the codebase misspell 'Viewport' as 'ViewPort' or 'view_port'.
This patch makes everything consistent.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gui.h b/src/gui.h
index 181472f55..943f6a14a 100644
--- a/src/gui.h
+++ b/src/gui.h
@@ -55,8 +55,8 @@ void ShowStoryBook(CompanyID company, uint16 page_id = INVALID_STORY_PAGE);
 
 void ShowEstimatedCostOrIncome(Money cost, int x, int y);
 
-void ShowExtraViewPortWindow(TileIndex tile = INVALID_TILE);
-void ShowExtraViewPortWindowForTileUnderCursor();
+void ShowExtraViewportWindow(TileIndex tile = INVALID_TILE);
+void ShowExtraViewportWindowForTileUnderCursor();
 
 /* bridge_gui.cpp */
 void ShowBuildBridgeWindow(TileIndex start, TileIndex end, TransportType transport_type, byte bridge_type);