Related: tdf#149932 honour PANGO_UNDERLINE_NONE for preedit underline

at least don't show an underline for PANGO_UNDERLINE_NONE

Change-Id: I190f44e1dfb7da1c663ce588973278d0da591c46
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/142222
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/unx/gtk3/gtkframe.cxx b/vcl/unx/gtk3/gtkframe.cxx
index 33a4278..d937e8e 100644
--- a/vcl/unx/gtk3/gtkframe.cxx
+++ b/vcl/unx/gtk3/gtkframe.cxx
@@ -5712,8 +5712,12 @@ OUString GtkSalFrame::GetPreeditDetails(GtkIMContext* pIMContext, std::vector<Ex
                    rCursorFlags |= EXTTEXTINPUT_CURSOR_INVISIBLE;
                    break;
                case PANGO_ATTR_UNDERLINE:
                    sal_attr |= ExtTextInputAttr::Underline;
                {
                    PangoAttrInt* pango_underline = reinterpret_cast<PangoAttrInt*>(pango_attr);
                    if (pango_underline->value != PANGO_UNDERLINE_NONE)
                        sal_attr |= ExtTextInputAttr::Underline;
                    break;
                }
                case PANGO_ATTR_STRIKETHROUGH:
                    sal_attr |= ExtTextInputAttr::RedText;
                    break;
@@ -5723,7 +5727,7 @@ OUString GtkSalFrame::GetPreeditDetails(GtkIMContext* pIMContext, std::vector<Ex
            pango_attribute_destroy (pango_attr);
            tmp_list = tmp_list->next;
        }
        if (sal_attr == ExtTextInputAttr::NONE)
        if (!attr_list)
            sal_attr |= ExtTextInputAttr::Underline;
        g_slist_free (attr_list);