Disable changing window size only after first.

--HG--
branch : develop

src/app/valentina/dialogs/dialoglayoutsettings.cpp

@@ -58,7 +58,7 @@ const DialogLayoutSettings::FormatsVector DialogLayoutSettings::pageFormatNames
 //---------------------------------------------------------------------------------------------------------------------
 DialogLayoutSettings::DialogLayoutSettings(VLayoutGenerator *generator, QWidget *parent, bool disableSettings)
     : QDialog(parent), disableSettings(disableSettings), ui(new Ui::DialogLayoutSettings), oldPaperUnit(Unit::Mm),
-      oldLayoutUnit(Unit::Mm), generator(generator)
+      oldLayoutUnit(Unit::Mm), generator(generator), isInitialized(false)
 {
     ui->setupUi(this);
 
@@ -100,9 +100,6 @@ DialogLayoutSettings::DialogLayoutSettings(VLayoutGenerator *generator, QWidget
 
     QPushButton *bRestoreDefaults = ui->buttonBox->button(QDialogButtonBox::RestoreDefaults);
     connect(bRestoreDefaults, &QPushButton::clicked, this, &DialogLayoutSettings::RestoreDefaults);
-
-    setMaximumSize(size());
-    setMinimumSize(size());
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -334,6 +331,27 @@ QString DialogLayoutSettings::MakeGroupsHelp()
     return tr("\n\tThree groups: big, middle, small = 0\n\tTwo groups: big, small = 1\n\tDescending area = 2\n");
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+void DialogLayoutSettings::showEvent(QShowEvent *event)
+{
+    QDialog::showEvent( event );
+    if ( event->spontaneous() )
+    {
+        return;
+    }
+
+    if (isInitialized)
+    {
+        return;
+    }
+    // do your init stuff here
+
+    setMaximumSize(size());
+    setMinimumSize(size());
+
+    isInitialized = true;//first show windows are held
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 void DialogLayoutSettings::ConvertLayoutSize()
 {

src/app/valentina/dialogs/dialoglayoutsettings.h

@@ -100,6 +100,8 @@ public:
     qreal LayoutToPixels(qreal value) const;
     qreal PageToPixels(qreal value) const;
     static QString MakeGroupsHelp();
+protected:
+    virtual void showEvent(QShowEvent *event) Q_DECL_OVERRIDE;
 public slots:
     void ConvertPaperSize();
     void ConvertLayoutSize();
@@ -123,6 +125,7 @@ private:
     Unit oldPaperUnit;
     Unit oldLayoutUnit;
     VLayoutGenerator *generator;
+    bool isInitialized;
 
     void InitPaperUnits();
     void InitLayoutUnits();