Fix #17666: Map edge glitches when using mountain near it

distribution/changelog.txt

@@ -9,6 +9,7 @@
 - Change: [#20550] Change SEK conversion rate from 1 GBP to 0.1 GBP.
 - Fix: [#6152] Camera and UI are no longer locked at 40 Hz, providing a smoother experience.
 - Fix: [#9534] Screams no longer cut-off on steep diagonal drops.
+- Fix: [#17666] Using the mountain tool near the edge of the map with clearance checks disabled causes visual glitches.
 - Fix: [#19450] The correct element is now auto-suggested when building a Medium Half Loop backwards.
 - Fix: [#19822] Tile inspector does not deep copy banners.
 - Fix: [#19823] Parkobj: disallow overriding objects of different object types.

src/openrct2/actions/LandSetHeightAction.cpp

@@ -177,13 +177,7 @@ GameActions::Result LandSetHeightAction::Execute() const
 
 StringId LandSetHeightAction::CheckParameters() const
 {
-    if (!LocationValid(_coords))
-    {
-        return STR_OFF_EDGE_OF_MAP;
-    }
-
-    auto mapSizeMax = GetMapSizeMaxXY();
-    if (_coords.x > mapSizeMax.x || _coords.y > mapSizeMax.y)
+    if (!LocationValid(_coords) || MapIsEdge(_coords))
     {
         return STR_OFF_EDGE_OF_MAP;
     }

src/openrct2/network/NetworkBase.cpp

@@ -43,7 +43,7 @@
 // It is used for making sure only compatible builds get connected, even within
 // single OpenRCT2 version.
 
-#define NETWORK_STREAM_VERSION "15"
+#define NETWORK_STREAM_VERSION "16"
 
 #define NETWORK_STREAM_ID OPENRCT2_VERSION "-" NETWORK_STREAM_VERSION