Select correct cell when calling freezePane

Fixes a bug when calling `$sheet->freezePane('B2')` without a second argument.
The selected cell will now be `B2` instead of the incorrect `B3`.

Fixes #389
Closes #393

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Use proper € symbol for currency format - [#379](https://github.com/PHPOffice/PhpSpreadsheet/pull/379)
 - Read printing area correctly when skipping some sheets - [#371](https://github.com/PHPOffice/PhpSpreadsheet/issues/371)
 - Avoid incorrectly overwriting calculated value type - [#394](https://github.com/PHPOffice/PhpSpreadsheet/issues/394)
+- Select correct cell when calling freezePane - [#389](https://github.com/PHPOffice/PhpSpreadsheet/issues/389)
 
 ## [1.1.0] - 2018-01-28
 

src/PhpSpreadsheet/Worksheet/Worksheet.php

@@ -1971,7 +1971,7 @@ class Worksheet implements IComparable
      *
      *     - A2 will freeze the rows above cell A2 (i.e row 1)
      *     - B1 will freeze the columns to the left of cell B1 (i.e column A)
-     *     - B2 will freeze the rows above and to the left of cell A2 (i.e row 1 and column A)
+     *     - B2 will freeze the rows above and to the left of cell B2 (i.e row 1 and column A)
      *
      * @param null|string $cell Position of the split
      * @param null|string $topLeftCell default position of the right bottom pane
@@ -1988,7 +1988,7 @@ class Worksheet implements IComparable
 
         if ($cell !== null && $topLeftCell === null) {
             $coordinate = Coordinate::coordinateFromString($cell);
-            $topLeftCell = $coordinate[0] . ($coordinate[1] + 1);
+            $topLeftCell = $coordinate[0] . $coordinate[1];
         }
 
         $this->freezePane = $cell;

tests/PhpSpreadsheetTests/Worksheet/WorksheetTest.php

@@ -123,4 +123,11 @@ class WorksheetTest extends TestCase
         $sheet->setCodeName('Test Code Name', false);
         self::assertSame('Test Code Name', $sheet->getCodeName());
     }
+
+    public function testFreezePaneSelectedCell()
+    {
+        $worksheet = new Worksheet();
+        $worksheet->freezePane('B2');
+        self::assertSame('B2', $worksheet->getTopLeftCell());
+    }
 }