Bug fix sidebar state during restore (#526)

* fix side bar state being incorrect during restore

* isVisible is invalid during restore state

* Make visibleTabCount function consistent with hasVisibleTabs. Add a bit of documentation.

---------

Co-authored-by: Syarif Fakhri <fakhri.s@duerr-ndt.com>

Author: SyarifFakhri

src/AutoHideSideBar.cpp

@@ -279,7 +279,7 @@ bool CAutoHideSideBar::eventFilter(QObject *watched, QEvent *event)
 		 show();
 	     break;
 
-	case QEvent::Hide:
+	case QEvent::HideToParent:
 		 if (!hasVisibleTabs())
 		 {
 			 hide();
@@ -321,7 +321,7 @@ int CAutoHideSideBar::visibleTabCount() const
 	int count = 0;
 	for (auto i = 0; i < tabCount(); i++)
 	{
-		if (tabAt(i)->isVisible())
+		if (tabAt(i)->isVisibleTo(parentWidget()))
 		{
 			count++;
 		}
@@ -336,7 +336,7 @@ bool CAutoHideSideBar::hasVisibleTabs() const
 {
 	for (auto i = 0; i < tabCount(); i++)
 	{
-		if (tabAt(i)->isVisible())
+		if (tabAt(i)->isVisibleTo(parentWidget()))
 		{
 			return true;
 		}

src/AutoHideSideBar.h

@@ -135,14 +135,14 @@ class ADS_EXPORT CAutoHideSideBar : public QScrollArea
 	int tabCount() const;
 
 	/**
-	 * Returns the number of visible tabs
+	 * Returns the number of visible tabs to its parent widget.
 	 */
 	int visibleTabCount() const;
 
 	/**
-	 * Returns true, if the sidebar contains visible tabs.
+	 * Returns true, if the sidebar contains visible tabs to its parent widget.
 	 * The function returns as soon as it finds the first visible tab.
-	 * That means, if you just want to find out if theee are visible tabs
+	 * That means, if you just want to find out if there are visible tabs
 	 * then this function is quicker than visibleTabCount()
 	 */
 	bool hasVisibleTabs() const;