STORM-281 : Fix Map FOV frustum when UI size not equal to 1

doc/contributions.txt

@@ -381,6 +381,8 @@ Malwina Dollinger
 	CT-138
 march Korda
 	SVC-1020
+Marine Kelley
+    STORM-281
 Matthew Dowd
 	VWR-1344
 	VWR-1651

indra/newview/llworldmapview.cpp

@@ -880,8 +880,10 @@ void LLWorldMapView::drawFrustum()
 	F32 half_width_meters = far_clip_meters * tan( horiz_fov / 2 );
 	F32 half_width_pixels = half_width_meters * meters_to_pixels;
 	
-	F32 ctr_x = getLocalRect().getWidth() * 0.5f + sPanX;
-	F32 ctr_y = getLocalRect().getHeight() * 0.5f + sPanY;
+    // Compute the frustum coordinates. Take the UI scale into account.
+    F32 ui_scale_factor = gSavedSettings.getF32("UIScaleFactor");
+	F32 ctr_x = (getLocalRect().getWidth() * 0.5f + sPanX)  * ui_scale_factor;
+	F32 ctr_y = (getLocalRect().getHeight() * 0.5f + sPanY) * ui_scale_factor;
 
 	gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);