From b8366228fb3f952a66737dd40061d607d19f7e0e Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 14 Sep 2022 12:33:18 +0530
Subject: [PATCH] Do not show the virtual libraries tab bar when no virtual
 libraries are present. See #1988609 ([Enhancement] VL Toolbar/Menu options)

---
 src/calibre/gui2/init.py                     | 10 +++++++---
 src/calibre/gui2/search_restriction_mixin.py | 10 +++++-----
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/calibre/gui2/init.py b/src/calibre/gui2/init.py
index c19f4a241c..cb25dad68f 100644
--- a/src/calibre/gui2/init.py
+++ b/src/calibre/gui2/init.py
@@ -400,7 +400,7 @@ class VLTabs(QTabBar):  # {{{
         self.currentChanged.connect(self.tab_changed)
         self.tabMoved.connect(self.tab_moved, type=Qt.ConnectionType.QueuedConnection)
         self.tabCloseRequested.connect(self.tab_close)
-        self.setVisible(gprefs['show_vl_tabs'])
+        self.update_visibility()
         self.next_action = a = QAction(self)
         a.triggered.connect(partial(self.next_tab, delta=1)), self.gui.addAction(a)
         self.previous_action = a = QAction(self)
@@ -421,14 +421,17 @@ class VLTabs(QTabBar):  # {{{
             idx = (self.currentIndex() + delta) % self.count()
             self.setCurrentIndex(idx)
 
+    def update_visibility(self):
+        self.setVisible(gprefs['show_vl_tabs'] and self.count() > 1)
+
     def enable_bar(self):
         gprefs['show_vl_tabs'] = True
-        self.setVisible(True)
+        self.update_visibility()
         self.gui.set_number_of_books_shown()
 
     def disable_bar(self):
         gprefs['show_vl_tabs'] = False
-        self.setVisible(False)
+        self.update_visibility()
         self.gui.set_number_of_books_shown()
 
     def lock_tab(self):
@@ -515,6 +518,7 @@ class VLTabs(QTabBar):  # {{{
                 # On some OS X machines (using native style) the tab button is
                 # on the left
                 pass
+        self.update_visibility()
 
     def update_current(self):
         self.rebuild()
diff --git a/src/calibre/gui2/search_restriction_mixin.py b/src/calibre/gui2/search_restriction_mixin.py
index 1d92905a54..6d4a9d29ed 100644
--- a/src/calibre/gui2/search_restriction_mixin.py
+++ b/src/calibre/gui2/search_restriction_mixin.py
@@ -397,11 +397,11 @@ class SearchRestrictionMixin:
             m.addMenu(a).setIcon(QIcon.ic('minus.png'))
             m.addAction(QIcon.ic('toc.png'), _('Quick select Virtual library'), self.choose_vl_triggerred)
 
-        if add_tabs_action:
-            if gprefs['show_vl_tabs']:
-                m.addAction(_('Hide Virtual library tabs'), self.vl_tabs.disable_bar)
-            else:
-                m.addAction(_('Show Virtual libraries as tabs'), self.vl_tabs.enable_bar)
+            if add_tabs_action:
+                if gprefs['show_vl_tabs']:
+                    m.addAction(_('Hide Virtual library tabs'), self.vl_tabs.disable_bar)
+                else:
+                    m.addAction(_('Show Virtual libraries as tabs'), self.vl_tabs.enable_bar)
 
         m.addSeparator()