[LyX/master] Fix compilation with Qt < 5.12

commit a7d6879ea20620668d3919e59024dc59f327fb35
Author: Juergen Spitzmueller <[email protected]>
Date:   Mon Jul 20 08:39:43 2026 +0200

    Fix compilation with Qt < 5.12
---
 src/frontends/qt/GuiDocument.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/frontends/qt/GuiDocument.cpp b/src/frontends/qt/GuiDocument.cpp
index 908b3f855f..fb38039e6f 100644
--- a/src/frontends/qt/GuiDocument.cpp
+++ b/src/frontends/qt/GuiDocument.cpp
@@ -5244,7 +5244,7 @@ void GuiDocument::paramsToDialog()
 	QList<QTreeWidgetItem *> specialScriptFontItems;
 	for (auto const & itt : bp_.special_fonts_roman) {
 		QString const scname = toqstr(itt.first);
-		if (scname.isLower()) {
+		if (scname == scname.toLower()) {
 			QTreeWidgetItem * item = new QTreeWidgetItem(fontSpecialModule->langFontsTW);
 			Language const * l = languages.getLanguage(itt.first);
 			if (l == nullptr)
@@ -5281,7 +5281,7 @@ void GuiDocument::paramsToDialog()
 	}
 	for (auto const & itt : bp_.special_fonts_sans) {
 		QString const scname = toqstr(itt.first);
-		if (scname.isLower()) {
+		if (scname == scname.toLower()) {
 			QTreeWidgetItem * item = new QTreeWidgetItem(fontSpecialModule->langFontsTW);
 			Language const * l = languages.getLanguage(itt.first);
 			if (l == nullptr)
@@ -5322,7 +5322,7 @@ void GuiDocument::paramsToDialog()
 	}
 	for (auto const & itt : bp_.special_fonts_typewriter) {
 		QString const scname = toqstr(itt.first);
-		if (scname.isLower()) {
+		if (scname == scname.toLower()) {
 			QTreeWidgetItem * item = new QTreeWidgetItem(fontSpecialModule->langFontsTW);
 			Language const * l = languages.getLanguage(itt.first);
 			if (l == nullptr)
-- 
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