Renamed FmViewExtraDlg unit as FmActiveTextPreviewDlg, TViewExtraDlg form class as TActiveTextPreviewDlg and HTML template file dlg-viewextra-tplt.html as dlg-activetext-preview-tplt.html. This was done because the dialogue box no longer relates only to "extra" text and the name had become misleading.
Modified code and variables that referred to "extra" to something more relevant.