PICARD-2130: Added a placeholder text "cover" to cover_image_filename input

This indicates the default being used if the image filename is not configured.

picard/coverart/image.py

@@ -4,7 +4,7 @@
 #
 # Copyright (C) 2007 Oliver Charles
 # Copyright (C) 2007, 2010-2011 Lukáš Lalinský
-# Copyright (C) 2007-2011, 2014, 2018-2020 Philipp Wolfer
+# Copyright (C) 2007-2011, 2014, 2018-2021 Philipp Wolfer
 # Copyright (C) 2011 Michael Wiencek
 # Copyright (C) 2011-2012, 2015 Wieland Hoffmann
 # Copyright (C) 2013-2015, 2018-2019 Laurent Monin
@@ -41,7 +41,10 @@ from PyQt5.QtCore import (
 )
 
 from picard import log
-from picard.config import get_config
+from picard.config import (
+    Option,
+    get_config,
+)
 from picard.coverart.utils import translate_caa_type
 from picard.metadata import Metadata
 from picard.util import (
@@ -289,7 +292,7 @@ class CoverArtImage:
             metadata.add_unique("coverart_types", cover_type)
         filename = script_to_filename(filename, metadata)
         if not filename:
-            filename = "cover"
+            filename = Option.get('setting', 'cover_image_filename').default
         if not is_absolute_path(filename):
             filename = os.path.join(dirname, filename)
         return encode_filename(filename)

picard/ui/options/cover.py

@@ -28,6 +28,7 @@
 from picard.config import (
     BoolOption,
     ListOption,
+    Option,
     TextOption,
     get_config,
 )
@@ -71,6 +72,7 @@ class CoverOptionsPage(OptionsPage):
         super().__init__(parent)
         self.ui = Ui_CoverOptionsPage()
         self.ui.setupUi(self)
+        self.ui.cover_image_filename.setPlaceholderText(Option.get('setting', 'cover_image_filename').default)
         self.ui.save_images_to_files.clicked.connect(self.update_filename)
         self.ui.save_images_to_tags.clicked.connect(self.update_save_images_to_tags)
         self.ui.save_only_one_front_image.toggled.connect(self.ui.image_type_as_filename.setDisabled)