Incorrect tab selection when resource editor is closed and then a new one is opened

Steps to reproduce:

1. open a resource in Atomic Editor
2. open another one (after this step we have two tabs)
3. close the first one
4. open another one

Result: Both tabs are selected and we can see the contents of the tab
created in step 2 instead of the one in step 4

This happens only when we close tabs that reside on the left hand side
of the currently selected tab.

Reason: TBTabContainer::m_current_page is not updated when tabs are
closed

Source/ThirdParty/TurboBadger/tb_tab_container.cpp

@@ -20,6 +20,13 @@ void TBTabLayout::OnChildAdded(TBWidget *child)
     }
 }
 
+void TBTabLayout::OnChildRemove(TBWidget *child)
+{
+	int index = GetIndexFromChild(child);
+	if (index < tabContainer_->m_current_page)
+		--tabContainer_->m_current_page;
+}
+
 PreferredSize TBTabLayout::OnCalculatePreferredContentSize(const SizeConstraints &constraints)
 {
     PreferredSize ps = TBLayout::OnCalculatePreferredContentSize(constraints);
@@ -39,6 +46,7 @@ TBTabContainer::TBTabContainer()
     : m_need_page_update(true)
     , m_current_page(-1)
     , m_align(TB_ALIGN_TOP)
+	, m_tab_layout(this)
 {
     AddChild(&m_root_layout);
     // Put the tab layout on top of the content in Z order so their skin can make

Source/ThirdParty/TurboBadger/tb_tab_container.h

@@ -10,6 +10,8 @@
 
 namespace tb {
 
+class TBTabContainer;
+
 /** TBTabLayout is a TBLayout used in TBTabContainer to apply
     some default properties on any TBButton added to it. */
 class TBTabLayout : public TBLayout
@@ -18,14 +20,22 @@ public:
     // For safe typecasting
     TBOBJECT_SUBCLASS(TBTabLayout, TBLayout);
 
+	TBTabLayout(TBTabContainer *tabContainer) 
+		: tabContainer_(tabContainer) {}
+
     virtual void OnChildAdded(TBWidget *child);
+	virtual void OnChildRemove(TBWidget *child);
+
     virtual PreferredSize OnCalculatePreferredContentSize(const SizeConstraints &constraints);
+private:
+	TBTabContainer *tabContainer_;
 };
 
 /** TBTabContainer - A container with tabs for multiple pages. */
 
 class TBTabContainer : public TBWidget
 {
+	friend class TBTabLayout;
 public:
     // For safe typecasting
     TBOBJECT_SUBCLASS(TBTabContainer, TBWidget);