Overrided on_dpi_changed() for some Dialogs:

AboutDialog, ConfigSnapshotDialog, FirmwareDialog, SysInfoDialog

+ set correct fonts for KBShortcutsDialog

src/slic3r/GUI/ConfigSnapshotDialog.hpp

@@ -2,6 +2,7 @@
 #define slic3r_GUI_ConfigSnapshotDialog_hpp_
 
 #include "GUI.hpp"
+#include "GUI_Utils.hpp"
 
 #include <wx/wx.h>
 #include <wx/intl.h>
@@ -14,18 +15,23 @@ namespace Config {
 	class SnapshotDB;
 }
 
-class ConfigSnapshotDialog : public wxDialog
+class ConfigSnapshotDialog : public DPIDialog
 {
 public:
     ConfigSnapshotDialog(const Config::SnapshotDB &snapshot_db, const wxString &id);
     const std::string& snapshot_to_activate() const { return m_snapshot_to_activate; }
 
+protected:
+    void on_dpi_changed(const wxRect &suggested_rect) override;
+
 private:
     void onLinkClicked(wxHtmlLinkEvent &event);
     void onCloseDialog(wxEvent &);
 
     // If set, it contains a snapshot ID to be restored after the dialog closes.
     std::string m_snapshot_to_activate;
+
+    wxHtmlWindow* html;
 };
 
 } // namespace GUI