Fix identation textarea (related to issue #117)

src/main/java/htmlflow/visitor/HtmlVisitor.java

@@ -134,6 +134,23 @@ public final void newlineAndIndent(){
             isClosed = true;
         }
     }
+    /**
+     * Adds a new line.
+     * Checks whether the parent element is still opened or not (!isClosed).
+     * If it is open then it closes the parent begin tag with ">" (!isClosed).
+     */
+    public final void newline(){
+        if (isClosed){
+            write("\n");
+        } else {
+            depth++;
+            write(FINISH_TAG);
+            if(isIndented)
+                write("\n");
+
+            isClosed = true;
+        }
+    }
 
     /**
      * This method appends the String {@code "<elementName"} and it leaves the element
@@ -159,7 +176,9 @@ public final void visitElement(Element element) {
     @Override
     public final void visitParent(Element element) {
         depth--;
-        newlineAndIndent();
+        if(!element.getName().equals("textarea")){
+            newlineAndIndent();
+        }
         endTag(out, element.getName()); // </elementName>
     }
     /**
@@ -195,7 +214,7 @@ public final void visitAttributeBoolean(String name, String value) {
 
     @Override
     public final <R> void visitText(Text<? extends Element, R> text) {
-        newlineAndIndent();
+        newline();
         write(HtmlEscapers.htmlEscaper().escape(text.getValue()));
     }
     /**

src/test/java/htmlflow/test/TestIndentation.java

@@ -77,6 +77,36 @@ public void viewWithNoIndent() {
         String actual = view.setIndented(false).render();
         assertEquals(expected, actual);
     }
+
+    @Test
+    public void viewWithTextAreaAndIndent() {
+        HtmlView<?> view = HtmlFlow.view(page -> page
+                .div()
+                .textarea()
+                .text("Sample text\nfoo\nbar")
+                .__()
+                .script()
+                .raw("// some comment" + lineSeparator() +
+                        "console.log('Hello world');")
+                .__() // script
+                .__()); // div
+
+
+        String expectedResult = 
+        "<div>" + lineSeparator() +
+        "\t<textarea>"+lineSeparator() +
+        "Sample text" + lineSeparator() +
+        "foo" + lineSeparator() +
+        "bar</textarea>" + lineSeparator() +
+        "\t<script>" + lineSeparator() +
+        "\t\t// some comment" + lineSeparator() +
+        "console.log('Hello world');" + lineSeparator() +
+        "\t</script>" + lineSeparator() +
+        "</div>";
+
+        String actual = view.setIndented(true).render();
+        assertEquals(expectedResult, actual);
+    }
     @Test
     public void viewAsyncWithNoIndent() {
         HtmlViewAsync<?> view = HtmlFlow.viewAsync(page -> page