[LyX/master] Replace obsoleted signal

[Juergen Spitzmueller]

commit 2c553df178f143a849d3e3f064c7c583df07017d
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sun Mar 21 12:51:38 2021 +0100

    Replace obsoleted signal
    
    This has been obsoleted in Qt5 and dropped in Qt6
---
 src/frontends/qt/FloatPlacement.cpp |    4 ++--
 src/frontends/qt/FloatPlacement.h   |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/frontends/qt/FloatPlacement.cpp b/src/frontends/qt/FloatPlacement.cpp
index 21d13e9..c11d457 100644
--- a/src/frontends/qt/FloatPlacement.cpp
+++ b/src/frontends/qt/FloatPlacement.cpp
@@ -269,10 +269,10 @@ string const FloatPlacement::getAlignment() const
 }
 
 
-void FloatPlacement::on_placementCO_currentIndexChanged(QString const & text)
+void FloatPlacement::on_placementCO_currentIndexChanged(int index)
 {
 	checkAllowed();
-	if (text != "custom")
+	if (placementCO->itemText(index) != "custom")
 		return;
 	if (topCB->isChecked() || bottomCB->isChecked()
 	   || pageCB->isChecked() || herepossiblyCB->isChecked()
diff --git a/src/frontends/qt/FloatPlacement.h b/src/frontends/qt/FloatPlacement.h
index fcdafc3..bf13633 100644
--- a/src/frontends/qt/FloatPlacement.h
+++ b/src/frontends/qt/FloatPlacement.h
@@ -54,7 +54,7 @@ public:
 	std::string const getAlignment() const;
 
 private Q_SLOTS:
-	void on_placementCO_currentIndexChanged(QString const &);
+	void on_placementCO_currentIndexChanged(int);
 	void changedSlot();
 
 private: