Fixing issue in contain/mathching regarding dot notation

Previously it was impossible to use dot notation on two
different calls to matching/contain when part of the string was
shared (for example Articles.SpecialTags.Tags and Articles.SpecialTags.Authors)

The issue was that the second call would override the settings
created for the first one.

src/ORM/EagerLoader.php

@@ -281,7 +281,10 @@ class EagerLoader
                 $options = isset($options['config']) ?
                     $options['config'] + $options['associations'] :
                     $options;
-                $options = $this->_reformatContain($options, []);
+                $options = $this->_reformatContain(
+                    $options,
+                    isset($pointer[$table]) ? $pointer[$table] : []
+                );
             }
 
             if ($options instanceof Closure) {

tests/Fixture/SpecialTagsFixture.php

@@ -47,7 +47,7 @@ class SpecialTagsFixture extends TestFixture
      * @var array
      */
     public $records = [
-        ['article_id' => 1, 'tag_id' => 3, 'highlighted' => false, 'highlighted_time' => null, 'author_id' => null],
-        ['article_id' => 2, 'tag_id' => 1, 'highlighted' => true, 'highlighted_time' => '2014-06-01 10:10:00', 'author_id' => null]
+        ['article_id' => 1, 'tag_id' => 3, 'highlighted' => false, 'highlighted_time' => null, 'author_id' => 1],
+        ['article_id' => 2, 'tag_id' => 1, 'highlighted' => true, 'highlighted_time' => '2014-06-01 10:10:00', 'author_id' => 2]
     ];
 }

tests/TestCase/ORM/QueryRegressionTest.php

@@ -968,4 +968,33 @@ class QueryRegressionTest extends TestCase
         $this->assertNotEmpty($result->tags, 'Missing tags');
         $this->assertNotEmpty($result->tags[0]->_joinData, 'Missing join data');
     }
+
+    /**
+     * Tests that it is possible to use matching with dot notation
+     * even when part of the part of the path in the dot notation is
+     * shared for two different calls
+     *
+     * @return void
+     */
+    public function testDotNotationNotOverride()
+    {
+        $table = TableRegistry::get('Comments');
+        $articles = $table->belongsTo('Articles');
+        $specialTags = $articles->hasMany('SpecialTags');
+        $specialTags->belongsTo('Authors');
+        $specialTags->belongsTo('Tags');
+
+        $results = $table
+            ->find()
+            ->select(['name' => 'Authors.name', 'tag' => 'Tags.name'])
+            ->matching('Articles.SpecialTags.Tags')
+            ->matching('Articles.SpecialTags.Authors', function ($q) {
+                return $q->where(['Authors.id' => 2]);
+            })
+            ->distinct()
+            ->hydrate(false)
+            ->toArray();
+
+        $this->assertEquals([['name' => 'nate', 'tag' => 'tag1']], $results);
+    }
 }