Remove usages of deprecated APIs of corelib

- Replaced the usages of deprecated APIs of corelib by corresponding
  alternatives in the library code and documentation.

- Modified the tests to make them build when deprecated APIs disabled:
    * Made the the parts of the tests testing the deprecated APIs to
      be compiled conditionally, only when the corresponding methods are
      enabled.
    * If the test-case tests only the deprecated API, but not the
      corresponding replacement, added tests for the replacement.

Task-number: QTBUG-76491
Task-number: QTBUG-76539
Task-number: QTBUG-76541
Change-Id: I62ed4a5b530a965ec3f6502c6480808f938921aa
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 5 insertions, 2 deletions

diff --git a/tests/auto/corelib/io/qsettings/tst_qsettings.cpp b/tests/auto/corelib/io/qsettings/tst_qsettings.cpp
index 8b69518ef7..a71a68e457 100644
--- a/tests/auto/corelib/io/qsettings/tst_qsettings.cpp
+++ b/tests/auto/corelib/io/qsettings/tst_qsettings.cpp
@@ -311,8 +311,11 @@ void tst_QSettings::initTestCase()
 
 void tst_QSettings::cleanupTestFiles()
 {
-    QSettings::setSystemIniPath(settingsPath("__system__"));
-    QSettings::setUserIniPath(settingsPath("__user__"));
+    QSettings::setPath(QSettings::IniFormat, QSettings::SystemScope, settingsPath("__system__"));
+    QSettings::setPath(QSettings::NativeFormat, QSettings::SystemScope, settingsPath("__system__"));
+
+    QSettings::setPath(QSettings::IniFormat, QSettings::UserScope, settingsPath("__user__"));
+    QSettings::setPath(QSettings::NativeFormat, QSettings::UserScope, settingsPath("__user__"));
 
     QDir settingsDir(settingsPath());
     if (settingsDir.exists())