commit 5a3201a8c4373d92ef3c750c72b6ae4c8a9388b0
Author: Enrico Forestieri <for...@lyx.org>
Date:   Wed Oct 18 13:12:20 2017 +0200

    Speed up exit time
    
    Instantiating a single QSettings and using it for each ui element
    can significantly shorten the time required to save the various
    states at exit. The speed up can be better appreciated on *nix,
    where the settings are saved on disk, rather than on Windows where
    they are held in memory (in the registry).
    
    (cherry picked from commit 3b43fbfbb18cc4535aba3fd77c6a3cf21835dafa)
---
 src/frontends/qt4/Dialog.cpp          |    3 +--
 src/frontends/qt4/Dialog.h            |    3 ++-
 src/frontends/qt4/GuiCharacter.cpp    |    5 ++---
 src/frontends/qt4/GuiCharacter.h      |    2 +-
 src/frontends/qt4/GuiCitation.cpp     |    5 ++---
 src/frontends/qt4/GuiCitation.h       |    2 +-
 src/frontends/qt4/GuiParagraph.cpp    |    5 ++---
 src/frontends/qt4/GuiParagraph.h      |    2 +-
 src/frontends/qt4/GuiProgressView.cpp |    5 ++---
 src/frontends/qt4/GuiProgressView.h   |    2 +-
 src/frontends/qt4/GuiToolbar.cpp      |    3 +--
 src/frontends/qt4/GuiToolbar.h        |    4 +++-
 src/frontends/qt4/GuiView.cpp         |    6 ++++--
 src/frontends/qt4/GuiViewSource.cpp   |    9 ++++-----
 src/frontends/qt4/GuiViewSource.h     |    4 ++--
 15 files changed, 29 insertions(+), 31 deletions(-)

diff --git a/src/frontends/qt4/Dialog.cpp b/src/frontends/qt4/Dialog.cpp
index e1fddaa..2369738 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 c5ccd2d..5f958e7 100644
--- a/src/frontends/qt4/Dialog.h
+++ b/src/frontends/qt4/Dialog.h
@@ -20,6 +20,7 @@
 
 #include <QString>
 
+class QSettings;
 class QWidget;
 
 namespace lyx {
@@ -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 ff7cc5d..1e92db8 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 423bc8a..8328211 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 1d78da6..cecdbca 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 5f093cc..008d2d5 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 0c8e01a..656e70f 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 aee410f..735d58c 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 3424d8f..9a50908 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 f7593a2..9498909 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 d519548..db96e0e 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 6df840a..badd599 100644
--- a/src/frontends/qt4/GuiToolbar.h
+++ b/src/frontends/qt4/GuiToolbar.h
@@ -20,6 +20,8 @@
 #include <QToolBar>
 #include <QToolButton>
 
+class QSettings;
+
 namespace lyx {
 
 class DocumentClass;
@@ -84,7 +86,7 @@ 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 f936c33..c587460 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 80d3c0b..04c6bf5 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 873f8db..48f2903 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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