Change the application name set in Qt to calibre from libprs500. Fixes #1623397 [[Enhancement] Change APP_UID from 'libprs500' to 'Calibre'](https://bugs.launchpad.net/calibre/+bug/1623397)

I looked into the code and the only place QSettings appears to be used
is to store the last used settings of the Qt WebKit Inspector. I think
it is acceptable to lose those settings to get rid of libprs500,
especially since some X11 implementations brokenly display the app name
in their user interfaces.

src/calibre/gui2/__init__.py

@@ -12,11 +12,9 @@ from PyQt5.Qt import (
     QDesktopServices, QFileDialog, QFileIconProvider, QSettings, QIcon,
     QApplication, QDialog, QUrl, QFont, QFontDatabase, QLocale, QFontInfo)
 
-ORG_NAME = 'KovidsBrain'
-APP_UID  = 'libprs500'
 from calibre import prints
 from calibre.constants import (islinux, iswindows, isbsd, isfrozen, isosx,
-        plugins, config_dir, filesystem_encoding, isxp, DEBUG)
+        plugins, config_dir, filesystem_encoding, isxp, DEBUG, __version__, __appname__ as APP_UID)
 from calibre.utils.config import Config, ConfigProxy, dynamic, JSONConfig
 from calibre.ebooks.metadata import MetaInformation
 from calibre.utils.date import UNDEFINED_DATE
@@ -886,6 +884,10 @@ class Application(QApplication):
                 # control this, if needed.
                 # Could have options: auto, off, 1.25, 1.5, 1.75, 2, 2.25, 2.5
                 QApplication.setAttribute(Qt.AA_EnableHighDpiScaling, True)
+        QApplication.setOrganizationName('calibre-ebook.com')
+        QApplication.setOrganizationDomain(QApplication.organizationName())
+        QApplication.setApplicationVersion(__version__)
+        QApplication.setApplicationName(APP_UID)
         QApplication.__init__(self, qargs)
         self.setAttribute(Qt.AA_UseHighDpiPixmaps)
         if DEBUG and not headless:

src/calibre/gui2/lrf_renderer/main.py

@@ -8,7 +8,7 @@ from PyQt5.Qt import (
 from calibre import __appname__, setup_cli_handlers, islinux, isbsd
 from calibre.ebooks.lrf.lrfparser import LRFDocument
 
-from calibre.gui2 import ORG_NAME, APP_UID, error_dialog, \
+from calibre.gui2 import error_dialog, \
                          config, choose_files, Application
 from calibre.gui2.dialogs.conversion_error import ConversionErrorDialog
 from calibre.gui2.lrf_renderer.main_ui import Ui_MainWindow
@@ -307,8 +307,6 @@ def main(args=sys.argv, logger=None):
         override = 'calibre-lrf-viewer' if islinux else None
         app = Application(args, override_program_name=override)
         app.setWindowIcon(QIcon(I('viewer.png')))
-        QCoreApplication.setOrganizationName(ORG_NAME)
-        QCoreApplication.setApplicationName(APP_UID)
         opts = normalize_settings(parser, opts)
         stream = open(args[1], 'rb') if len(args) > 1 else None
         main = file_renderer(stream, opts, logger=logger)

src/calibre/gui2/main.py

@@ -13,7 +13,7 @@ from calibre.constants import (iswindows, __appname__, isosx, DEBUG, islinux,
         filesystem_encoding, get_portable_base)
 from calibre.utils.ipc import gui_socket_address, RC
 from calibre.gui2 import (
-    ORG_NAME, APP_UID, initialize_file_icon_provider, Application, choose_dir,
+    initialize_file_icon_provider, Application, choose_dir,
     error_dialog, question_dialog, gprefs, setup_gui_option_parser)
 from calibre.gui2.main_window import option_parser as _option_parser
 from calibre.gui2.splash_screen import SplashScreen
@@ -95,8 +95,6 @@ def init_qt(args):
         if os.path.isdir(libpath):
             prefs.set('library_path', os.path.abspath(libpath))
             prints('Using library at', prefs['library_path'])
-    QCoreApplication.setOrganizationName(ORG_NAME)
-    QCoreApplication.setApplicationName(APP_UID)
     override = 'calibre-gui' if islinux else None
     app = Application(args, override_program_name=override)
     app.file_event_hook = EventAccumulator()

src/calibre/gui2/tweak_book/main.py

@@ -11,7 +11,7 @@ import sys, os, importlib, time
 from PyQt5.Qt import QIcon
 
 from calibre.constants import islinux, iswindows
-from calibre.gui2 import Application, ORG_NAME, APP_UID, setup_gui_option_parser, decouple, set_gui_prefs
+from calibre.gui2 import Application, setup_gui_option_parser, decouple, set_gui_prefs
 from calibre.ptempfile import reset_base_dir
 from calibre.utils.config import OptionParser
 
@@ -66,8 +66,6 @@ def _run(args, notify=None):
     app.file_event_hook = EventAccumulator()
     app.load_builtin_fonts()
     app.setWindowIcon(QIcon(I('tweak.png')))
-    Application.setOrganizationName(ORG_NAME)
-    Application.setApplicationName(APP_UID)
     main = Main(opts, notify=notify)
     main.set_exception_handler()
     main.show()

src/calibre/gui2/viewer/main.py

@@ -13,7 +13,7 @@ from calibre.gui2.viewer.ui import Main as MainWindow
 from calibre.gui2.viewer.toc import TOC
 from calibre.gui2.widgets import ProgressIndicator
 from calibre.gui2 import (
-    Application, ORG_NAME, APP_UID, choose_files, info_dialog, error_dialog,
+    Application, choose_files, info_dialog, error_dialog,
     open_url, setup_gui_option_parser)
 from calibre.ebooks.oeb.iterator.book import EbookIterator
 from calibre.constants import islinux, filesystem_encoding, DEBUG, iswindows
@@ -1227,8 +1227,6 @@ def main(args=sys.argv):
     app.file_event_hook = acc
     app.load_builtin_fonts()
     app.setWindowIcon(QIcon(I('viewer.png')))
-    QApplication.setOrganizationName(ORG_NAME)
-    QApplication.setApplicationName(APP_UID)
 
     if vprefs['singleinstance']:
         try: