Edit Book: Fix live link syntax highlighting not being updated correctly after renaming an open file

src/calibre/gui2/tweak_book/boss.py

@@ -552,7 +552,8 @@ class Boss(QObject):
         self.set_modified()
         for oldname, newname in name_map.iteritems():
             if oldname in editors:
-                editors[newname] = editors.pop(oldname)
+                editors[newname] = ed = editors.pop(oldname)
+                ed.change_document_name(newname)
                 self.gui.central.rename_editor(editors[newname], newname)
             if self.gui.preview.current_name == oldname:
                 self.gui.preview.current_name = newname

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

@@ -139,6 +139,9 @@ class Editor(QMainWindow):
     def pretty_print(self, name):
         return False
 
+    def change_document_name(self, newname):
+        pass
+
     def get_raw_data(self):
         return self.canvas.get_image_data(quality=self.quality)
 

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

@@ -222,6 +222,10 @@ class TextEdit(PlainTextEdit):
             c = self.textCursor()
             c.insertText('')
 
+    def change_document_name(self, newname):
+        self.highlighter.doc_name = newname
+        self.highlighter.rehighlight()  # Ensure links are checked w.r.t. to the new name correctly
+
     def replace_text(self, text):
         c = self.textCursor()
         pos = c.position()

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

@@ -159,6 +159,9 @@ class Editor(QMainWindow):
     def init_from_template(self, template):
         self.editor.load_text(template, syntax=self.syntax, process_template=True, doc_name=editor_name(self))
 
+    def change_document_name(self, newname):
+        self.editor.change_document_name(newname)
+
     def get_raw_data(self):
         # The EPUB spec requires NFC normalization, see section 1.3.6 of
         # http://www.idpf.org/epub/20/spec/OPS_2.0.1_draft.htm