Edit book: A new action to toggle line wrapping mode in all code edit…

…ors. Can be assigned via Preferences->Keyboard shortcuts->Global actions

or added to the toolbar via Preferences->Toolbars->Book wide actions

src/calibre/gui2/tweak_book/boss.py

@@ -1844,6 +1844,13 @@ def do_editor_paste(self):
         if ed is not None:
             ed.paste()
 
+    def toggle_line_wrapping_in_all_editors(self):
+        tprefs['editor_line_wrap'] ^= True
+        yes = tprefs['editor_line_wrap']
+        for ed in editors.values():
+            if getattr(ed, 'editor', None) and hasattr(ed.editor, 'apply_line_wrap_mode'):
+                ed.editor.apply_line_wrap_mode(yes)
+
     def editor_data_changed(self, editor):
         self.gui.preview.start_refresh_timer()
         for name, ed in iteritems(editors):

src/calibre/gui2/tweak_book/editor/text.py

@@ -226,10 +226,13 @@ def is_modified(self, val):
     def sizeHint(self):
         return self.size_hint
 
+    def apply_line_wrap_mode(self, yes: bool = True) -> None:
+        self.setLineWrapMode(QPlainTextEdit.LineWrapMode.WidgetWidth if yes else QPlainTextEdit.LineWrapMode.NoWrap)
+
     def apply_settings(self, prefs=None, dictionaries_changed=False):  # {{{
         prefs = prefs or tprefs
         self.setAcceptDrops(prefs.get('editor_accepts_drops', True))
-        self.setLineWrapMode(QPlainTextEdit.LineWrapMode.WidgetWidth if prefs['editor_line_wrap'] else QPlainTextEdit.LineWrapMode.NoWrap)
+        self.apply_line_wrap_mode(prefs['editor_line_wrap'])
         with suppress(Exception):
             self.setCursorWidth(int(prefs.get('editor_cursor_width', 1)))
         theme = get_theme(prefs['editor_theme'])

src/calibre/gui2/tweak_book/ui.py

@@ -411,6 +411,9 @@ def treg(icon, text, target, sid, keys, description):
                                       self.boss.import_book, 'import-book', (), _('Import an HTML or DOCX file as a new book'))
         self.action_quick_edit = treg('modified.png', _('&Quick open a file to edit'), self.boss.quick_open, 'quick-open', ('Ctrl+T'), _(
             'Quickly open a file from the book to edit it'))
+        self.action_editor_toggle_wrap = treg(
+            'format-justify-fill.png', _('Toggle code line &wrapping'), self.boss.toggle_line_wrapping_in_all_editors, 'editor-toggle-wrap', (), _(
+                'Toggle line wrapping in all code editor tabs'))
 
         # Editor actions
         group = _('Editor actions')