issue #7087 Invalid (X)HTML in case of \mscfile, \dotfile, \diafile

Adding closing and opening paragraph tag before / after the  `\mscfile` etc. as a `\mscfile` can only appear inside a paragraph and would always be a "new" paragraph.

Author: albert-github

src/htmldocvisitor.cpp

@@ -1785,6 +1785,7 @@ void HtmlDocVisitor::operator()(const DocDotFile &df)
 {
   if (m_hide) return;
   if (!Config_getBool(DOT_CLEANUP)) copyFile(df.file(),Config_getString(HTML_OUTPUT)+"/"+stripPath(df.file()));
+  m_t << "</p>";
   m_t << "<div class=\"dotgraph\">\n";
   writeDotFile(df.file(),df.relPath(),df.context(),df.srcFile(),df.srcLine());
   if (df.hasCaption())
@@ -1797,12 +1798,14 @@ void HtmlDocVisitor::operator()(const DocDotFile &df)
     m_t << "</div>\n";
   }
   m_t << "</div>\n";
+  m_t << "<p>";
 }
 
 void HtmlDocVisitor::operator()(const DocMscFile &df)
 {
   if (m_hide) return;
   if (!Config_getBool(DOT_CLEANUP)) copyFile(df.file(),Config_getString(HTML_OUTPUT)+"/"+stripPath(df.file()));
+  m_t << "</p>";
   m_t << "<div class=\"mscgraph\">\n";
   writeMscFile(df.file(),df.relPath(),df.context(),df.srcFile(),df.srcLine());
   if (df.hasCaption())
@@ -1815,12 +1818,14 @@ void HtmlDocVisitor::operator()(const DocMscFile &df)
     m_t << "</div>\n";
   }
   m_t << "</div>\n";
+  m_t << "<p>";
 }
 
 void HtmlDocVisitor::operator()(const DocDiaFile &df)
 {
   if (m_hide) return;
   if (!Config_getBool(DOT_CLEANUP)) copyFile(df.file(),Config_getString(HTML_OUTPUT)+"/"+stripPath(df.file()));
+  m_t << "</p>";
   m_t << "<div class=\"diagraph\">\n";
   writeDiaFile(df.file(),df.relPath(),df.context(),df.srcFile(),df.srcLine());
   if (df.hasCaption())
@@ -1833,6 +1838,7 @@ void HtmlDocVisitor::operator()(const DocDiaFile &df)
     m_t << "</div>\n";
   }
   m_t << "</div>\n";
+  m_t << "<p>";
 }
 
 void HtmlDocVisitor::operator()(const DocLink &lnk)