Fix bugs

Author: siddharthabishnu

src/Models/HydrostaticFreeSurfaceModels/SplitExplicitFreeSurfaces/split_explicit_free_surface.jl

@@ -311,7 +311,7 @@ function maybe_extend_halos(TX, TY, grid, substepping::FixedSubstepNumber)
 
     old_halos = halo_size(grid)
     Nsubsteps = length(substepping.averaging_weights)
-    step_halo = Nsubsteps + 1
+    step_halo = Nsubsteps + 2
 
     Hx = TX() isa ConnectedTopology ? max(step_halo, old_halos[1]) : old_halos[1]
     Hy = TY() isa ConnectedTopology ? max(step_halo, old_halos[2]) : old_halos[2]

test/test_tripolar_grid.jl

@@ -98,7 +98,7 @@ end
 
         @test Hx == halo_size(grid, 1)
         @test Hy != halo_size(grid, 2)
-        @test Hy == length(free_surface.substepping.averaging_weights) + 1
+        @test Hy == length(free_surface.substepping.averaging_weights) + 2
 
         @test begin
             time_step!(model, 1.0)