From d21bc5faf1a49475928b6f6fbc1ac4e2e25e0e75 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 1 Mar 2026 03:55:52 +0000
Subject: [PATCH] ManageTagList: remember expanded/collapsed state between
 invocations

Fixes #3026
---
 src/calibre/gui2/tweak_book/__init__.py |  1 +
 src/calibre/gui2/tweak_book/widgets.py  | 19 ++++++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/tweak_book/__init__.py b/src/calibre/gui2/tweak_book/__init__.py
index 44fe06ee01..6a81964f1a 100644
--- a/src/calibre/gui2/tweak_book/__init__.py
+++ b/src/calibre/gui2/tweak_book/__init__.py
@@ -58,6 +58,7 @@ d['pretty_print_on_open'] = False
 d['disable_completion_popup_for_search'] = False
 d['saved_searches'] = []
 d['insert_tag_mru'] = ['p', 'div', 'li', 'h1', 'h2', 'h3', 'h4', 'em', 'strong', 'td', 'tr']
+d['manage_tag_list_collapsed_tags'] = []
 d['spell_check_case_sensitive_sort'] = False
 d['inline_spell_check'] = True
 d['custom_themes'] = {}
diff --git a/src/calibre/gui2/tweak_book/widgets.py b/src/calibre/gui2/tweak_book/widgets.py
index a31a3471d8..4a8b0ce690 100644
--- a/src/calibre/gui2/tweak_book/widgets.py
+++ b/src/calibre/gui2/tweak_book/widgets.py
@@ -121,6 +121,7 @@ class ManageTagList(Dialog):  # {{{
 
     def __init__(self, parent=None):
         self._entries = list(tprefs['insert_tag_mru'])
+        self._collapsed_tags = set(tprefs.get('manage_tag_list_collapsed_tags', []))
         Dialog.__init__(self, _('Manage tag list'), 'manage-insert-tag-listx', parent=parent)
 
     def sizeHint(self):
@@ -160,6 +161,7 @@ class ManageTagList(Dialog):  # {{{
         return m.group() if m else entry
 
     def _populate_tree(self):
+        self._save_expanded_state()
         self.tree.clear()
         groups = {}
         for entry in self._entries:
@@ -173,7 +175,7 @@ class ManageTagList(Dialog):  # {{{
                 child.setData(0, Qt.ItemDataRole.UserRole, entry)
                 parent_item.addChild(child)
             self.tree.addTopLevelItem(parent_item)
-            parent_item.setExpanded(True)
+            parent_item.setExpanded(tag_name not in self._collapsed_tags)
         self._update_button_states()
 
     def _current_entry(self):
@@ -230,10 +232,25 @@ class ManageTagList(Dialog):  # {{{
             pass
         self._populate_tree()
 
+    def _save_expanded_state(self):
+        root = self.tree.invisibleRootItem()
+        for i in range(root.childCount()):
+            item = root.child(i)
+            if item.isExpanded():
+                self._collapsed_tags.discard(item.text(0))
+            else:
+                self._collapsed_tags.add(item.text(0))
+        tprefs['manage_tag_list_collapsed_tags'] = list(self._collapsed_tags)
+
     def accept(self):
+        self._save_expanded_state()
         tprefs['insert_tag_mru'] = self._entries
         super().accept()
 
+    def reject(self):
+        self._save_expanded_state()
+        super().reject()
+
 # }}}