[LyX/2.3.x] Backport another straightforward deprecation fix

[Juergen Spitzmueller]

commit 007a49a1326784d6940d4f1459c355a40f8cf60e
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sat Mar 13 10:46:59 2021 +0100

    Backport another straightforward deprecation fix
---
 src/frontends/qt4/DockView.h        |    2 +-
 src/frontends/qt4/FindAndReplace.h  |    2 +-
 src/frontends/qt4/GuiProgressView.h |    2 +-
 src/frontends/qt4/GuiSetBorder.h    |    2 +-
 src/frontends/qt4/GuiSpellchecker.h |    2 +-
 src/frontends/qt4/GuiToc.h          |    2 +-
 src/frontends/qt4/GuiViewSource.h   |    2 +-
 7 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/frontends/qt4/DockView.h b/src/frontends/qt4/DockView.h
index 3c54c2a..4e2f4ad 100644
--- a/src/frontends/qt4/DockView.h
+++ b/src/frontends/qt4/DockView.h
@@ -38,7 +38,7 @@ public:
 	         Qt::DockWidgetArea area = Qt::LeftDockWidgetArea, ///< Position of
 															   ///the dock (and
 															   ///also drawer)
-	         Qt::WindowFlags flags = 0);
+	         Qt::WindowFlags flags = {});
 
 	virtual ~DockView() {}
 
diff --git a/src/frontends/qt4/FindAndReplace.h b/src/frontends/qt4/FindAndReplace.h
index da854da..b117d7e 100644
--- a/src/frontends/qt4/FindAndReplace.h
+++ b/src/frontends/qt4/FindAndReplace.h
@@ -78,7 +78,7 @@ public:
 	FindAndReplace(
 		GuiView & parent, ///< the main window where to dock.
 		Qt::DockWidgetArea area = Qt::RightDockWidgetArea, ///< Position of the dock (and also drawer)
-		Qt::WindowFlags flags = 0);
+		Qt::WindowFlags flags = {});
 
 	~FindAndReplace();
 
diff --git a/src/frontends/qt4/GuiProgressView.h b/src/frontends/qt4/GuiProgressView.h
index 9498909..51e4a55 100644
--- a/src/frontends/qt4/GuiProgressView.h
+++ b/src/frontends/qt4/GuiProgressView.h
@@ -47,7 +47,7 @@ public:
 	GuiProgressView(
 		GuiView & parent, ///< the main window where to dock.
 		Qt::DockWidgetArea area, ///< Position of the dock (and also drawer)
-		Qt::WindowFlags flags = 0);
+		Qt::WindowFlags flags = {});
 
 	~GuiProgressView();
 	/// Controller inherited method.
diff --git a/src/frontends/qt4/GuiSetBorder.h b/src/frontends/qt4/GuiSetBorder.h
index 7230e4d..cf7415c 100644
--- a/src/frontends/qt4/GuiSetBorder.h
+++ b/src/frontends/qt4/GuiSetBorder.h
@@ -26,7 +26,7 @@ class GuiSetBorder : public QWidget
 {
 	Q_OBJECT
 public:
-	GuiSetBorder(QWidget * parent = 0, Qt::WindowFlags fl = 0);
+	GuiSetBorder(QWidget * parent = 0, Qt::WindowFlags fl = {});
 
 	// We need tristate for multi-cell selection
 	enum BorderState {
diff --git a/src/frontends/qt4/GuiSpellchecker.h b/src/frontends/qt4/GuiSpellchecker.h
index 5851e8c..b9fe8e6 100644
--- a/src/frontends/qt4/GuiSpellchecker.h
+++ b/src/frontends/qt4/GuiSpellchecker.h
@@ -65,7 +65,7 @@ public:
 	GuiSpellchecker(
 		GuiView & parent, ///< the main window where to dock.
 		Qt::DockWidgetArea area = Qt::RightDockWidgetArea, ///< Position of the dock (and also drawer)
-		Qt::WindowFlags flags = 0);
+		Qt::WindowFlags flags = {});
 	~GuiSpellchecker();
 
 private:
diff --git a/src/frontends/qt4/GuiToc.h b/src/frontends/qt4/GuiToc.h
index d403bc9..bf06103 100644
--- a/src/frontends/qt4/GuiToc.h
+++ b/src/frontends/qt4/GuiToc.h
@@ -32,7 +32,7 @@ public:
 	GuiToc(
 		GuiView & parent, ///< the main window where to dock.
 		Qt::DockWidgetArea area = Qt::LeftDockWidgetArea, ///< Position of the dock (and also drawer)
-		Qt::WindowFlags flags = 0);
+		Qt::WindowFlags flags = {});
 
 	///
 	bool initialiseParams(std::string const & data);
diff --git a/src/frontends/qt4/GuiViewSource.h b/src/frontends/qt4/GuiViewSource.h
index 48f2903..3d35587 100644
--- a/src/frontends/qt4/GuiViewSource.h
+++ b/src/frontends/qt4/GuiViewSource.h
@@ -100,7 +100,7 @@ public:
 	GuiViewSource(
 		GuiView & parent, ///< the main window where to dock.
 		Qt::DockWidgetArea area = Qt::BottomDockWidgetArea, ///< Position of the dock (and also drawer)
-		Qt::WindowFlags flags = 0);
+		Qt::WindowFlags flags = {});
 
 	/// Controller inherited method.
 	///@{