Fix nullable LatLng? crash in MainActivity camera idle listener

Same MapLibre 13.0.1 nullable corner fix — use listOfNotNull() and
guard on size == 4 before calling loadWindGrid.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

1 files changed, 12 insertions, 4 deletions

diff --git a/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt b/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
index ad5746d..6d02014 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
@@ -327,10 +327,18 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
             }
 
             maplibreMap.addOnCameraIdleListener {
-                val r = maplibreMap.projection.visibleRegion
-                val lats = listOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude)
-                val lons = listOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude)
-                viewModel.loadWindGrid(lats.min(), lats.max(), lons.min(), lons.max())
+                val corners = listOfNotNull(
+                    maplibreMap.projection.visibleRegion.nearLeft,
+                    maplibreMap.projection.visibleRegion.nearRight,
+                    maplibreMap.projection.visibleRegion.farLeft,
+                    maplibreMap.projection.visibleRegion.farRight
+                )
+                if (corners.size == 4) {
+                    viewModel.loadWindGrid(
+                        corners.minOf { it.latitude }, corners.maxOf { it.latitude },
+                        corners.minOf { it.longitude }, corners.maxOf { it.longitude }
+                    )
+                }
             }
 
             maplibreMap.addOnMapLongClickListener { _ ->