On Tue, Oct 17, 2017 at 12:08:20PM +0200, Jürgen Spitzmüller wrote:
> 2017-10-17 9:36 GMT+02:00 Pavel Sanda <sa...@lyx.org>:
> 
> > Jean-Marc Lasgouttes wrote:
> > > Good catch. A solution is porbably to instantiate a QSettings in
> > > saveUISettings and pass it as parameter of the various saveSession()
> > > methods.
> >
> > If there is no other user of saveSession that sounds like best option.
> >
> 
> It should be rather safe:
> http://doc.qt.io/qt-4.8/qsettings.html#accessing-settings-from-multiple-threads-or-processes-simultaneously

This would be the attached patch. Now I don't experience any delay on quit.

-- 
Enrico
diff --git a/src/frontends/qt4/Dialog.cpp b/src/frontends/qt4/Dialog.cpp
index e1fddaaa7e..2369738c5c 100644
--- a/src/frontends/qt4/Dialog.cpp
+++ b/src/frontends/qt4/Dialog.cpp
@@ -275,9 +275,8 @@ QString Dialog::sessionKey() const
 }
 
 
-void Dialog::saveSession() const
+void Dialog::saveSession(QSettings & settings) const
 {
-       QSettings settings;
        settings.setValue(sessionKey() + "/geometry", 
asQWidget()->saveGeometry());
 }
 
diff --git a/src/frontends/qt4/Dialog.h b/src/frontends/qt4/Dialog.h
index c5ccd2d292..e189b62245 100644
--- a/src/frontends/qt4/Dialog.h
+++ b/src/frontends/qt4/Dialog.h
@@ -18,6 +18,7 @@
 
 #include "support/strfwd.h"
 
+#include <QSettings>
 #include <QString>
 
 class QWidget;
@@ -72,7 +73,7 @@ public:
         * This default implementation saves the geometry state.
         * Reimplement to save more settings.
         **/
-       virtual void saveSession() const;
+       virtual void saveSession(QSettings & settings) const;
 
        /// Restore session settings.
        /**
diff --git a/src/frontends/qt4/GuiCharacter.cpp 
b/src/frontends/qt4/GuiCharacter.cpp
index ff7cc5d10e..1e92db848d 100644
--- a/src/frontends/qt4/GuiCharacter.cpp
+++ b/src/frontends/qt4/GuiCharacter.cpp
@@ -466,10 +466,9 @@ void GuiCharacter::dispatchParams()
 }
 
 
-void GuiCharacter::saveSession() const
+void GuiCharacter::saveSession(QSettings & settings) const
 {
-       Dialog::saveSession();
-       QSettings settings;
+       Dialog::saveSession(settings);
        settings.setValue(sessionKey() + "/toggleall", 
toggleallCB->isChecked());
        settings.setValue(sessionKey() + "/autoapply", 
autoapplyCB->isChecked());
 }
diff --git a/src/frontends/qt4/GuiCharacter.h b/src/frontends/qt4/GuiCharacter.h
index 423bc8a3a5..8328211eb1 100644
--- a/src/frontends/qt4/GuiCharacter.h
+++ b/src/frontends/qt4/GuiCharacter.h
@@ -76,7 +76,7 @@ private:
        void dispatchParams();
        bool isBufferDependent() const { return true; }
        FuncCode getLfun() const { return LFUN_TEXTSTYLE_UPDATE; }
-       void saveSession() const;
+       void saveSession(QSettings & settings) const;
        void restoreSession();
        //@}
 
diff --git a/src/frontends/qt4/GuiCitation.cpp 
b/src/frontends/qt4/GuiCitation.cpp
index 1d78da61dd..cecdbca093 100644
--- a/src/frontends/qt4/GuiCitation.cpp
+++ b/src/frontends/qt4/GuiCitation.cpp
@@ -1049,10 +1049,9 @@ BiblioInfo const & GuiCitation::bibInfo() const
 }
 
 
-void GuiCitation::saveSession() const
+void GuiCitation::saveSession(QSettings & settings) const
 {
-       Dialog::saveSession();
-       QSettings settings;
+       Dialog::saveSession(settings);
        settings.setValue(
                sessionKey() + "/regex", regexp_->isChecked());
        settings.setValue(
diff --git a/src/frontends/qt4/GuiCitation.h b/src/frontends/qt4/GuiCitation.h
index 5f093cc21d..008d2d556d 100644
--- a/src/frontends/qt4/GuiCitation.h
+++ b/src/frontends/qt4/GuiCitation.h
@@ -79,7 +79,7 @@ private:
        void clearParams();
        void dispatchParams();
        bool isBufferDependent() const { return true; }
-       void saveSession() const;
+       void saveSession(QSettings & settings) const;
        void restoreSession();
        /** Disconnect from the inset when the Apply button is pressed.
         *  Allows easy insertion of multiple citations.
diff --git a/src/frontends/qt4/GuiParagraph.cpp 
b/src/frontends/qt4/GuiParagraph.cpp
index 0c8e01aaa4..656e70f304 100644
--- a/src/frontends/qt4/GuiParagraph.cpp
+++ b/src/frontends/qt4/GuiParagraph.cpp
@@ -384,10 +384,9 @@ bool GuiParagraph::hasLabelwidth() const
 }
 
 
-void GuiParagraph::saveSession() const
+void GuiParagraph::saveSession(QSettings & settings) const
 {
-       Dialog::saveSession();
-       QSettings settings;
+       Dialog::saveSession(settings);
        settings.setValue(sessionKey() + "/autoapply", 
synchronizedViewCB->isChecked());
 }
 
diff --git a/src/frontends/qt4/GuiParagraph.h b/src/frontends/qt4/GuiParagraph.h
index aee410f607..735d58ca8f 100644
--- a/src/frontends/qt4/GuiParagraph.h
+++ b/src/frontends/qt4/GuiParagraph.h
@@ -39,7 +39,7 @@ public:
        void enableView(bool enable);
        bool isBufferDependent() const { return true; }
        virtual FuncCode getLfun() const { return LFUN_PARAGRAPH_PARAMS_APPLY; }
-       void saveSession() const;
+       void saveSession(QSettings & settings) const;
        void restoreSession();
        //@}
 
diff --git a/src/frontends/qt4/GuiProgressView.cpp 
b/src/frontends/qt4/GuiProgressView.cpp
index 3424d8f451..9a5090832e 100644
--- a/src/frontends/qt4/GuiProgressView.cpp
+++ b/src/frontends/qt4/GuiProgressView.cpp
@@ -232,10 +232,9 @@ void GuiProgressView::appendText(QString const & text)
 }
 
 
-void GuiProgressView::saveSession() const
+void GuiProgressView::saveSession(QSettings & settings) const
 {
-       Dialog::saveSession();
-       QSettings settings;
+       Dialog::saveSession(settings);
        settings.setValue(
                sessionKey() + "/autoclear", widget_->autoClearCB->isChecked());
        settings.setValue(
diff --git a/src/frontends/qt4/GuiProgressView.h 
b/src/frontends/qt4/GuiProgressView.h
index f7593a2cc1..9498909319 100644
--- a/src/frontends/qt4/GuiProgressView.h
+++ b/src/frontends/qt4/GuiProgressView.h
@@ -61,7 +61,7 @@ public:
        void updateView() {}
        bool wantInitialFocus() const { return false; }
        void restoreSession();
-       void saveSession() const;
+       void saveSession(QSettings & settings) const;
        ///@}
 
 private Q_SLOTS:
diff --git a/src/frontends/qt4/GuiToolbar.cpp b/src/frontends/qt4/GuiToolbar.cpp
index d519548e07..db96e0e526 100644
--- a/src/frontends/qt4/GuiToolbar.cpp
+++ b/src/frontends/qt4/GuiToolbar.cpp
@@ -351,9 +351,8 @@ QString GuiToolbar::sessionKey() const
 }
 
 
-void GuiToolbar::saveSession() const
+void GuiToolbar::saveSession(QSettings & settings) const
 {
-       QSettings settings;
        settings.setValue(sessionKey() + "/visibility", visibility_);
        settings.setValue(sessionKey() + "/movability", isMovable());
 }
diff --git a/src/frontends/qt4/GuiToolbar.h b/src/frontends/qt4/GuiToolbar.h
index 6df840a9bd..cd597fb4b2 100644
--- a/src/frontends/qt4/GuiToolbar.h
+++ b/src/frontends/qt4/GuiToolbar.h
@@ -17,6 +17,7 @@
 #define GUITOOLBAR_H
 
 #include <QList>
+#include <QSettings>
 #include <QToolBar>
 #include <QToolButton>
 
@@ -84,7 +85,7 @@ public:
         **/
        QString sessionKey() const;
        /// Save session settings.
-       void saveSession() const;
+       void saveSession(QSettings & settings) const;
        /// Restore session settings.
        void restoreSession();
 
diff --git a/src/frontends/qt4/GuiView.cpp b/src/frontends/qt4/GuiView.cpp
index b0d7c86fd0..2aee2735d3 100644
--- a/src/frontends/qt4/GuiView.cpp
+++ b/src/frontends/qt4/GuiView.cpp
@@ -758,14 +758,16 @@ void GuiView::saveLayout() const
 
 void GuiView::saveUISettings() const
 {
+       QSettings settings;
+
        // Save the toolbar private states
        ToolbarMap::iterator end = d.toolbars_.end();
        for (ToolbarMap::iterator it = d.toolbars_.begin(); it != end; ++it)
-               it->second->saveSession();
+               it->second->saveSession(settings);
        // Now take care of all other dialogs
        map<string, DialogPtr>::const_iterator it = d.dialogs_.begin();
        for (; it!= d.dialogs_.end(); ++it)
-               it->second->saveSession();
+               it->second->saveSession(settings);
 }
 
 
diff --git a/src/frontends/qt4/GuiViewSource.cpp 
b/src/frontends/qt4/GuiViewSource.cpp
index 80d3c0b459..04c6bf5c34 100644
--- a/src/frontends/qt4/GuiViewSource.cpp
+++ b/src/frontends/qt4/GuiViewSource.cpp
@@ -367,9 +367,8 @@ void ViewSourceWidget::resizeEvent (QResizeEvent * event)
 }
 
 
-void ViewSourceWidget::saveSession(QString const & session_key) const
+void ViewSourceWidget::saveSession(QSettings & settings, QString const & 
session_key) const
 {
-       QSettings settings;
        settings.setValue(session_key + "/output", toqstr(view_format_));
        settings.setValue(session_key + "/contents", 
contentsCO->currentIndex());
        settings.setValue(session_key + "/autoupdate", 
autoUpdateCB->isChecked());
@@ -462,10 +461,10 @@ void GuiViewSource::updateTitle()
 }
 
 
-void GuiViewSource::saveSession() const
+void GuiViewSource::saveSession(QSettings & settings) const
 {
-       Dialog::saveSession();
-       widget_->saveSession(sessionKey());
+       Dialog::saveSession(settings);
+       widget_->saveSession(settings, sessionKey());
 }
 
 
diff --git a/src/frontends/qt4/GuiViewSource.h 
b/src/frontends/qt4/GuiViewSource.h
index 873f8dbf4f..48f2903b74 100644
--- a/src/frontends/qt4/GuiViewSource.h
+++ b/src/frontends/qt4/GuiViewSource.h
@@ -47,7 +47,7 @@ public:
        /// returns true if the string has changed
        bool setText(QString const & qstr = QString());
        ///
-       void saveSession(QString const & session_key) const;
+       void saveSession(QSettings & settings, QString const & session_key) 
const;
        ///
        void restoreSession(QString const & session_key);
        ///
@@ -112,7 +112,7 @@ public:
        bool canApplyToReadOnly() const { return true; }
        void updateView();
        void enableView(bool enable);
-       void saveSession() const;
+       void saveSession(QSettings & settings) const;
        void restoreSession();
        bool wantInitialFocus() const { return false; }
        ///@}

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