ENGCOM-1359: FIX for MSI issue #74 on qty increment #14806

 - Merge Pull Request #14806 from phoenix128/magento2:fix-qty-increment-decimal
 - Merged commits:
   1. 6701e96

Author: magento-engcom-team

app/code/Magento/CatalogInventory/Api/StockConfigurationInterface.php

@@ -77,7 +77,7 @@ public function getEnableQtyIncrements($storeId = null);
 
     /**
      * @param int $storeId
-     * @return int
+     * @return float
      */
     public function getQtyIncrements($store = null);
 

app/code/Magento/CatalogInventory/Model/Configuration.php

@@ -273,7 +273,7 @@ public function getEnableQtyIncrements($store = null)
 
     /**
      * @param null|string|bool|int|\Magento\Store\Model\Store $store
-     * @return int
+     * @return float
      */
     public function getQtyIncrements($store = null)
     {

app/code/Magento/CatalogInventory/Model/Stock/Item.php

@@ -392,7 +392,7 @@ public function getUseConfigQtyIncrements()
     /**
      * Retrieve Quantity Increments
      *
-     * @return int|false
+     * @return int|float|false
      */
     public function getQtyIncrements()
     {
@@ -401,7 +401,13 @@ public function getQtyIncrements()
                 if ($this->getUseConfigQtyIncrements()) {
                     $this->qtyIncrements = $this->stockConfiguration->getQtyIncrements($this->getStoreId());
                 } else {
-                    $this->qtyIncrements = (int) $this->getData(static::QTY_INCREMENTS);
+                    $this->qtyIncrements = $this->getData(static::QTY_INCREMENTS);
+                }
+
+                if ($this->getIsQtyDecimal()) { // Cast accordingly to decimal qty usage
+                    $this->qtyIncrements = (float) $this->qtyIncrements;
+                } else {
+                    $this->qtyIncrements = (int) $this->qtyIncrements;
                 }
             }
             if ($this->qtyIncrements <= 0) {

app/code/Magento/CatalogInventory/Test/Unit/Model/Stock/ItemTest.php

@@ -394,6 +394,7 @@ public function testGetQtyIncrements($config, $expected)
         $this->setDataArrayValue('qty_increments', $config['qty_increments']);
         $this->setDataArrayValue('enable_qty_increments', $config['enable_qty_increments']);
         $this->setDataArrayValue('use_config_qty_increments', $config['use_config_qty_increments']);
+        $this->setDataArrayValue('is_qty_decimal', $config['is_qty_decimal']);
         if ($config['use_config_qty_increments']) {
             $this->stockConfiguration->expects($this->once())
                 ->method('getQtyIncrements')
@@ -415,23 +416,44 @@ public function getQtyIncrementsDataProvider()
                 [
                     'qty_increments' => 1,
                     'enable_qty_increments' => true,
-                    'use_config_qty_increments' => true
+                    'use_config_qty_increments' => true,
+                    'is_qty_decimal' => false,
+                ],
+                1
+            ],
+            [
+                [
+                    'qty_increments' => 1.5,
+                    'enable_qty_increments' => true,
+                    'use_config_qty_increments' => true,
+                    'is_qty_decimal' => true,
+                ],
+                1.5
+            ],
+            [
+                [
+                    'qty_increments' => 1.5,
+                    'enable_qty_increments' => true,
+                    'use_config_qty_increments' => true,
+                    'is_qty_decimal' => false,
                 ],
                 1
             ],
             [
                 [
                     'qty_increments' => -2,
                     'enable_qty_increments' => true,
-                    'use_config_qty_increments' => true
+                    'use_config_qty_increments' => true,
+                    'is_qty_decimal' => false,
                 ],
                 false
             ],
             [
                 [
                     'qty_increments' => 3,
                     'enable_qty_increments' => true,
-                    'use_config_qty_increments' => false
+                    'use_config_qty_increments' => false,
+                    'is_qty_decimal' => false,
                 ],
                 3
             ],

app/code/Magento/CatalogInventory/view/adminhtml/ui_component/product_form.xml

@@ -571,7 +571,6 @@
                     <settings>
                         <scopeLabel>[GLOBAL]</scopeLabel>
                         <validation>
-                            <rule name="validate-digits" xsi:type="boolean">true</rule>
                             <rule name="validate-number" xsi:type="boolean">true</rule>
                         </validation>
                         <label translate="true">Qty Increments</label>