fix: correctly set compiler diagnostic columns

Author: mhanberg

lib/next_ls/extensions/elixir_extension.ex

@@ -58,11 +58,11 @@ defmodule NextLS.ElixirExtension do
     %GenLSP.Structures.Range{
       start: %GenLSP.Structures.Position{
         line: start_line - 1,
-        character: start_col
+        character: start_col - 1
       },
       end: %GenLSP.Structures.Position{
         line: end_line - 1,
-        character: end_col
+        character: end_col - 1
       }
     }
   end
@@ -71,7 +71,7 @@ defmodule NextLS.ElixirExtension do
     %GenLSP.Structures.Range{
       start: %GenLSP.Structures.Position{
         line: line - 1,
-        character: col
+        character: col - 1
       },
       end: %GenLSP.Structures.Position{
         line: line - 1,

test/next_ls/extensions/elixir_extension_test.exs

@@ -107,7 +107,7 @@ defmodule NextLS.ElixirExtensionTest do
                  range: %GenLSP.Structures.Range{
                    start: %GenLSP.Structures.Position{
                      line: 3,
-                     character: 7
+                     character: 6
                    },
                    end: %GenLSP.Structures.Position{
                      line: 3,
@@ -124,11 +124,11 @@ defmodule NextLS.ElixirExtensionTest do
                  range: %GenLSP.Structures.Range{
                    start: %GenLSP.Structures.Position{
                      line: 3,
-                     character: 7
+                     character: 6
                    },
                    end: %GenLSP.Structures.Position{
                      line: 7,
-                     character: 3
+                     character: 2
                    }
                  }
                }