[LyX/master] Address some deprecation warnings

[Juergen Spitzmueller]

commit f8021672ad60ac64c381862db4095fa32b736f6f
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sat Feb 13 15:22:26 2021 +0100

    Address some deprecation warnings
---
 src/frontends/qt/DockView.h        |    7 +++----
 src/frontends/qt/FindAndReplace.h  |    2 +-
 src/frontends/qt/GuiProgressView.h |    2 +-
 src/frontends/qt/GuiSetBorder.h    |    2 +-
 src/frontends/qt/GuiSpellchecker.h |    2 +-
 src/frontends/qt/GuiViewSource.h   |    2 +-
 6 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/src/frontends/qt/DockView.h b/src/frontends/qt/DockView.h
index 9c3a9e7..aef0c82 100644
--- a/src/frontends/qt/DockView.h
+++ b/src/frontends/qt/DockView.h
@@ -33,10 +33,9 @@ public:
 	DockView(GuiView & parent, ///< the main window where to dock.
 	         QString const & name, ///< dialog identifier.
 	         QString const & title, ///< dialog title.
-	         Qt::DockWidgetArea area = Qt::LeftDockWidgetArea, ///< Position of
-															   ///the dock (and
-															   ///also drawer)
-	         Qt::WindowFlags flags = 0);
+	         Qt::DockWidgetArea area = Qt::LeftDockWidgetArea, ///< Position of the dock
+								   /// (and also drawer)
+	         Qt::WindowFlags flags = {});
 
 	virtual ~DockView() {}
 
diff --git a/src/frontends/qt/FindAndReplace.h b/src/frontends/qt/FindAndReplace.h
index 169530a..565db5a 100644
--- a/src/frontends/qt/FindAndReplace.h
+++ b/src/frontends/qt/FindAndReplace.h
@@ -79,7 +79,7 @@ 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/qt/GuiProgressView.h b/src/frontends/qt/GuiProgressView.h
index 1a722b3..f49112b 100644
--- a/src/frontends/qt/GuiProgressView.h
+++ b/src/frontends/qt/GuiProgressView.h
@@ -47,7 +47,7 @@ public:
 	GuiProgressView(
 		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 = {});
 
 	~GuiProgressView();
 	/// Controller inherited method.
diff --git a/src/frontends/qt/GuiSetBorder.h b/src/frontends/qt/GuiSetBorder.h
index 5e44474..509c600 100644
--- a/src/frontends/qt/GuiSetBorder.h
+++ b/src/frontends/qt/GuiSetBorder.h
@@ -27,7 +27,7 @@ class GuiSetBorder : public QWidget
 {
 	Q_OBJECT
 public:
-	GuiSetBorder(QWidget * parent = nullptr, Qt::WindowFlags fl = nullptr);
+	GuiSetBorder(QWidget * parent = nullptr, Qt::WindowFlags fl = {});
 
 	// We need tristate for multi-cell selection
 	enum BorderState {
diff --git a/src/frontends/qt/GuiSpellchecker.h b/src/frontends/qt/GuiSpellchecker.h
index 1297157..0ee7df1 100644
--- a/src/frontends/qt/GuiSpellchecker.h
+++ b/src/frontends/qt/GuiSpellchecker.h
@@ -63,7 +63,7 @@ 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/qt/GuiViewSource.h b/src/frontends/qt/GuiViewSource.h
index 8b2a005..f75978d 100644
--- a/src/frontends/qt/GuiViewSource.h
+++ b/src/frontends/qt/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.
 	///@{