Edit book: Workaround for regression in Qt 5 that causes typing the C…

…md+some letter to generate text in the editor instead of being ignored.

https://bugreports.qt-project.org/browse/QTBUG-40933

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

@@ -17,6 +17,7 @@
     QApplication, QMimeData, QColor, QColorDialog, QTimer, pyqtSignal)
 
 from calibre import prepare_string_for_xml, xml_entity_to_unicode
+from calibre.constants import isosx
 from calibre.gui2.tweak_book import tprefs, TOP
 from calibre.gui2.tweak_book.editor import (
     SYNTAX_PROPERTY, SPELL_PROPERTY, SPELL_LOCALE_PROPERTY, store_locale, LINK_PROPERTY)
@@ -735,6 +736,11 @@ def keyPressEvent(self, ev):
             self.setOverwriteMode(self.overwriteMode() ^ True)
             ev.accept()
             return
+        if isosx and ev.modifiers() == Qt.ControlModifier and re.search(r'[a-zA-Z0-9]+', ev.text()) is not None:
+            # For some reason Qt 5 translates Cmd+key into text on OS X
+            # https://bugreports.qt-project.org/browse/QTBUG-40933
+            ev.setAccepted(False)
+            return
         QPlainTextEdit.keyPressEvent(self, ev)
         if (ev.key() == Qt.Key_Semicolon or ';' in unicode(ev.text())) and tprefs['replace_entities_as_typed'] and self.syntax == 'html':
             self.replace_possible_entity()