V805-014 Fixing NULL in symbols diff

Author: ogorodnik

source/ada/lsp-lal_utils.adb

@@ -1879,7 +1879,7 @@ package body LSP.Lal_Utils is
 
          if Span.first.line /= Span.last.line then
             Slice.Append
-              (Line.Slice (J1.Marker, Line.After_Last_Character.Marker));
+              (Line.Slice (J1.Marker, Line.At_Last_Character.Marker));
          end if;
 
          loop

testsuite/ada_lsp/V628-024.symbol_diff/test.json

@@ -201,19 +201,6 @@
                      },
                      "newText": "   "
                   },
-                  {
-                     "range": {
-                        "start": {
-                           "line": 9,
-                           "character": 0
-                        },
-                        "end": {
-                           "line": 9,
-                           "character": 0
-                        }
-                     },
-                     "newText": "\u0000"
-                  },
                   {
                      "range": {
                         "start": {