Panel: Change header markdown rendering to non-inline

src/Panel.vue

@@ -201,16 +201,43 @@
         return this.cardType === 'bg-light' || this.cardType === 'bg-white' || this.cardType === 'bg-warning';
       },
       headerContent () {
-        if (this.isSeamless) {
-            return this.caretHtml + ' ' + this.renderedHeader;
-        }
         return this.renderedHeader;
       },
       altContent () {
         return this.alt && md.render(this.alt) || this.renderedHeader;
       },
       renderedHeader () {
-        return md.renderInline(this.header);
+        let htmlRenderedHeader = md.render(this.header).trim();
+
+        if (this.isSeamless) {
+          // insert the caret to the header content
+          let caretAdded = false;
+
+          // if the header content is wrapped by a <p> or any <h1>, <h2>, ...
+          // then it must be inserted inside these HTML tags, otherwise the
+          // header content will not be in the same line as caret
+          const tags = [
+            ['<p>', '</p>'],
+            ['<h1>', '</h1>'],
+            ['<h2>', '</h2>'],
+            ['<h3>', '</h3>'],
+            ['<h4>', '</h4>'],
+            ['<h5>', '</h5>'],
+            ['<h6>', '</h6>']];
+
+          tags.forEach(header => {
+            if (!caretAdded && htmlRenderedHeader.startsWith(header[0]))  {
+              htmlRenderedHeader = jQuery(htmlRenderedHeader).unwrap().prepend(this.caretHtml + ' ')
+                .wrap(header[0] + header[1]).parent().html();
+              caretAdded = true;
+            }
+          });
+
+          if (!caretAdded) {
+            htmlRenderedHeader = this.caretHtml + ' ' + htmlRenderedHeader;
+          }
+        }
+        return htmlRenderedHeader;
       },
       hasSrc () {
         return this.src && this.src.length > 0;