Keep to show current script when closing all docs

also fix error when removing multiple tabs from TabContainer at same frame.
like closing multiple docs at once.

Fix #16403

editor/plugins/script_editor_plugin.cpp

@@ -505,7 +505,7 @@ void ScriptEditor::_show_error_dialog(String p_path) {
 	error_dialog->popup_centered_minsize();
 }
 
-void ScriptEditor::_close_tab(int p_idx, bool p_save) {
+void ScriptEditor::_close_tab(int p_idx, bool p_save, bool p_history_back) {
 
 	int selected = p_idx;
 	if (selected < 0 || selected >= tab_container->get_child_count())
@@ -521,7 +521,9 @@ void ScriptEditor::_close_tab(int p_idx, bool p_save) {
 	}
 
 	// roll back to previous tab
-	_history_back();
+	if (p_history_back) {
+		_history_back();
+	}
 
 	//remove from history
 	history.resize(history_pos + 1);
@@ -579,7 +581,7 @@ void ScriptEditor::_close_docs_tab() {
 		EditorHelp *se = Object::cast_to<EditorHelp>(tab_container->get_child(i));
 
 		if (se) {
-			_close_tab(i);
+			_close_tab(i, true, false);
 		}
 	}
 }

editor/plugins/script_editor_plugin.h

@@ -251,7 +251,7 @@ class ScriptEditor : public PanelContainer {
 
 	void _show_error_dialog(String p_path);
 
-	void _close_tab(int p_idx, bool p_save = true);
+	void _close_tab(int p_idx, bool p_save = true, bool p_history_back = true);
 
 	void _close_current_tab();
 	void _close_discard_current_tab(const String &p_str);

scene/gui/tab_container.cpp

@@ -474,21 +474,24 @@ void TabContainer::remove_child_notify(Node *p_child) {
 
 	Control::remove_child_notify(p_child);
 
-	int tc = get_tab_count();
+	call_deferred("_update_current_tab");
-	if (current == tc - 1) {
-		current--;
-		if (current < 0)
-			current = 0;
-		else {
-			call_deferred("set_current_tab", current);
-		}
-	}
 
 	p_child->disconnect("renamed", this, "_child_renamed_callback");
 
 	update();
 }
 
+void TabContainer::_update_current_tab() {
+
+	int tc = get_tab_count();
+	if (current >= tc)
+		current = tc - 1;
+	if (current < 0)
+		current = 0;
+	else
+		set_current_tab(current);
+}
+
 void TabContainer::set_tab_align(TabAlign p_align) {
 
 	ERR_FAIL_INDEX(p_align, 3);
@@ -664,6 +667,7 @@ void TabContainer::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("_child_renamed_callback"), &TabContainer::_child_renamed_callback);
 	ClassDB::bind_method(D_METHOD("_on_theme_changed"), &TabContainer::_on_theme_changed);
+	ClassDB::bind_method(D_METHOD("_update_current_tab"), &TabContainer::_update_current_tab);
 
 	ADD_SIGNAL(MethodInfo("tab_changed", PropertyInfo(Variant::INT, "tab")));
 	ADD_SIGNAL(MethodInfo("tab_selected", PropertyInfo(Variant::INT, "tab")));

scene/gui/tab_container.h

@@ -62,6 +62,7 @@ private:
 	Vector<Control *> _get_tabs() const;
 	int _get_tab_width(int p_index) const;
 	void _on_theme_changed();
+	void _update_current_tab();
 
 protected:
 	void _child_renamed_callback();