Edit Book: Add an option to turn off auto-completion of closing tags

src/calibre/gui2/tweak_book/__init__.py

@@ -64,6 +64,7 @@ d['editor_format_toolbar'] = [('format-text-' + x) if x else x for x in (
 d['spell_check_case_sensitive_search'] = False
 d['add_cover_preserve_aspect_ratio'] = False
 d['templates'] = {}
+d['auto_close_tags'] = True
 del d
 
 ucase_map = {l:string.ascii_uppercase[i] for i, l in enumerate(string.ascii_lowercase)}

src/calibre/gui2/tweak_book/editor/smarts/html.py

@@ -619,6 +619,8 @@ class Smarts(NullSmarts):
                 editor.setTextCursor(c)
 
     def auto_close_tag(self, editor):
+        if not tprefs['auto_close_tags']:
+            return False
 
         def check_if_in_tag(block, offset=0):
             if block.isValid():

src/calibre/gui2/tweak_book/preferences.py

@@ -194,6 +194,12 @@ class EditorSettings(BasicSettings):
             ' happens only when the trailing semi-colon is typed.'))
         l.addRow(lw)
 
+        lw = self('auto_close_tags')
+        lw.setText(_('Auto &close tags when typing </'))
+        lw.setToolTip('<p>' + _(
+            'With this option, every time you type </ the current HTML closing tag is auto-completed'))
+        l.addRow(lw)
+
         lw = self('editor_show_char_under_cursor')
         lw.setText(_('Show the name of the current character before the cursor along with the line and column number'))
         l.addRow(lw)