ADDED: support naked hyperlinks in tablecells and textboxes.

Also fix flickering due to IS_ROLLOVER flag getting
nuked.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/18832

include/string_utils.h

@@ -142,6 +142,11 @@ KICOMMON_API wxString RemoveHTMLTags( const wxString& aInput );
  */
 KICOMMON_API wxString LinkifyHTML( wxString aStr );
 
+/**
+ * Performs a URL sniff-test on a string.
+ */
+KICOMMON_API bool IsURL( wxString aStr );
+
 /**
  * Read one line line from \a aFile.
  *