Don't assume a hypertext link is a cross-sheet reference.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/20511

eeschema/sch_field.cpp

@@ -1012,11 +1012,14 @@ void SCH_FIELD::DoHypertextAction( EDA_DRAW_FRAME* aFrame ) const
     constexpr int START_ID = 1;
 
     if( IsHypertext() )
+    {
+        wxString href;
+
+        if( m_id == FIELD_T::INTERSHEET_REFS )
         {
             SCH_LABEL_BASE* label = static_cast<SCH_LABEL_BASE*>( m_parent );
             SCH_SHEET_PATH* sheet = &label->Schematic()->CurrentSheet();
             wxMenu          menu;
-        wxString        href;
 
             std::vector<std::pair<wxString, wxString>> pages;
 
@@ -1038,6 +1041,11 @@ void SCH_FIELD::DoHypertextAction( EDA_DRAW_FRAME* aFrame ) const
                 href = wxT( "#" ) + pages[ sel ].first;
             else if( sel == 999 )
                 href = SCH_NAVIGATE_TOOL::g_BackLink;
+        }
+        else if( IsURL( GetShownText( false ) ) )
+        {
+            href = GetShownText( false );
+        }
 
         if( !href.IsEmpty() )
         {