feat: Update addHtml to handle style inheritance

The aim is to get the output closer to the source html

src/PhpWord/Element/AbstractContainer.php

@@ -109,6 +109,7 @@ abstract class AbstractContainer extends AbstractElement
             } else {
                 // All other elements
                 array_unshift($args, $element); // Prepend element name to the beginning of args array
+
                 return call_user_func_array(array($this, 'addElement'), $args);
             }
         }

src/PhpWord/Shared/Html.php

@@ -364,7 +364,7 @@ class Html
         $cell = $element->addCell(null, $cellStyles);
 
         if (self::shouldAddTextRun($node)) {
-            return $cell->addTextRun(self::parseInlineStyle($node, $styles['paragraph']));
+            return $cell->addTextRun(self::filterOutNonInheritedStyles(self::parseInlineStyle($node, $styles['paragraph'])));
         }
 
         return $cell;
@@ -395,15 +395,51 @@ class Html
      */
     protected static function recursiveParseStylesInHierarchy(\DOMNode $node, array $style)
     {
-        $parentStyle = self::parseInlineStyle($node, array());
+        $parentStyle = array();
-        $style = array_merge($parentStyle, $style);
         if ($node->parentNode != null && XML_ELEMENT_NODE == $node->parentNode->nodeType) {
-            $style = self::recursiveParseStylesInHierarchy($node->parentNode, $style);
+            $parentStyle = self::recursiveParseStylesInHierarchy($node->parentNode, array());
         }
+        if ($node->nodeName === '#text') {
+            $parentStyle = array_merge($parentStyle, $style);
+        } else {
+            $parentStyle = self::filterOutNonInheritedStyles($parentStyle);
+        }
+        $style = self::parseInlineStyle($node, $parentStyle);
 
         return $style;
     }
 
+    /**
+     * Removes non-inherited styles from array
+     *
+     * @param array &$styles
+     */
+    protected static function filterOutNonInheritedStyles(array $styles)
+    {
+        $nonInheritedStyles = array(
+            'borderSize',
+            'borderTopSize',
+            'borderRightSize',
+            'borderBottomSize',
+            'borderLeftSize',
+            'borderColor',
+            'borderTopColor',
+            'borderRightColor',
+            'borderBottomColor',
+            'borderLeftColor',
+            'borderStyle',
+            'spaceAfter',
+            'spaceBefore',
+            'underline',
+            'strikethrough',
+            'hidden',
+        );
+
+        $styles = array_diff_key($styles, array_flip($nonInheritedStyles));
+
+        return $styles;
+    }
+
     /**
      * Parse list node
      *

tests/PhpWord/Shared/HtmlTest.php

@@ -293,11 +293,11 @@ class HtmlTest extends AbstractWebServerEmbeddedTest
     {
         $phpWord = new \PhpOffice\PhpWord\PhpWord();
         $section = $phpWord->addSection();
-        $html = '<table align="left" style="width: 50%; border: 6px #0000FF solid;">
+        $html = '<table align="left" style="width: 50%; border: 12px #0000FF double">
                 <thead>
-                    <tr style="background-color: #FF0000; text-align: center; color: #FFFFFF; font-weight: bold; ">
+                    <tr style="background-color: #FF0000; text-align: center; color: #FFFFFF; font-weight: bold">
-                        <th style="width: 50pt">header a</th>
+                        <th style="width: 50pt"><p>header a</p></th>
-                        <th style="width: 50; border-color: #00EE00">header b</th>
+                        <th style="width: 50; border-color: #00EE00; border-width: 3px"><span>header b</span></th>
                         <th style="border-color: #00AA00 #00BB00 #00CC00 #00DD00; border-width: 3px">header c</th>
                     </tr>
                 </thead>
@@ -324,6 +324,12 @@ class HtmlTest extends AbstractWebServerEmbeddedTest
         $this->assertEquals('00BB00', $doc->getElementAttribute('/w:document/w:body/w:tbl/w:tr[1]/w:tc[3]/w:tcPr/w:tcBorders/w:right', 'w:color'));
         $this->assertEquals('00CC00', $doc->getElementAttribute('/w:document/w:body/w:tbl/w:tr[1]/w:tc[3]/w:tcPr/w:tcBorders/w:bottom', 'w:color'));
         $this->assertEquals('00DD00', $doc->getElementAttribute('/w:document/w:body/w:tbl/w:tr[1]/w:tc[3]/w:tcPr/w:tcBorders/w:left', 'w:color'));
+
+        //check borders are not propagated inside cells
+        $this->assertTrue($doc->elementExists('/w:document/w:body/w:tbl/w:tr[1]/w:tc[1]/w:p'));
+        $this->assertFalse($doc->elementExists('/w:document/w:body/w:tbl/w:tr[1]/w:tc[1]/w:p/w:pPr/w:pBdr'));
+        $this->assertTrue($doc->elementExists('/w:document/w:body/w:tbl/w:tr[1]/w:tc[2]/w:p'));
+        $this->assertFalse($doc->elementExists('/w:document/w:body/w:tbl/w:tr[1]/w:tc[2]/w:p/w:pPr/w:pBdr'));
     }
 
     /**