KConfigGroup: fix writePathEntry/readPathEntry roundtrip for symlinks

If $HOME isn't canonical (e.g. on FreeBSD it's /home/user while the
canonical path is /usr/home/user), replacing the canonical version of $HOME
with $HOME means that we'll read back a different value than we wrote
in.
It might seem "equivalent" but it leads to surprises like
KRecentDocuments showing duplicates because /usr/home/user became
/home/user in the KConfig roundtrip (but not in the XBEL roundtrip).

This commit loses the replacement of /usr/home/user with $HOME on
FreeBSD, but I think an exact roundtrip is what we expect, rather than
stuff being modified under our feet. The alternative would be to
canonicalize everything in KRecentDocuments but users don't want to
see the /usr in front, I assume (so we would have to use a cache of
canonicalized path, for the removal of duplicates, awful performance
wise).

2 files changed, 10 insertions, 10 deletions

diff --git a/autotests/kconfigtest.cpp b/autotests/kconfigtest.cpp
index 77d0ddde..49b60f55 100644
--- a/autotests/kconfigtest.cpp
+++ b/autotests/kconfigtest.cpp
@@ -83,6 +83,7 @@ static const QVariantList s_variantlist_entry2{s_point_entry, s_size_entry};
 
 static const QString s_homepath{homePath() + QLatin1String{"/foo"}};
 static const QString s_homepath_escape{homePath() + QLatin1String("/foo/$HOME")};
+static const QString s_canonical_homepath{QFileInfo(homePath()).canonicalFilePath() + QLatin1String("/foo")};
 static const QString s_dollargroup{QStringLiteral("$i")};
 static const QString s_test_subdir{QStringLiteral("kconfigtest_subdir/")};
 static const QString s_kconfig_test_subdir(s_test_subdir + QLatin1String("kconfigtest"));
@@ -189,6 +190,7 @@ void KConfigTest::initTestCase()
     cg = KConfigGroup(&sc, "Path Type");
     cg.writePathEntry("homepath", s_homepath);
     cg.writePathEntry("homepathescape", s_homepath_escape);
+    cg.writePathEntry("canonicalHomePath", s_canonical_homepath);
 
     cg = KConfigGroup(&sc, "Enum Types");
 #if defined(_MSC_VER) && _MSC_VER == 1600
@@ -507,6 +509,7 @@ void KConfigTest::testPath()
     KConfigGroup sc3(&sc2, "Path Type");
     QCOMPARE(sc3.readPathEntry(QStringLiteral("homepath"), QString{}), s_homepath);
     QCOMPARE(sc3.readPathEntry(QStringLiteral("homepathescape"), QString{}), s_homepath_escape);
+    QCOMPARE(sc3.readPathEntry(QStringLiteral("canonicalHomePath"), QString{}), s_canonical_homepath);
     QCOMPARE(sc3.entryMap().value(QStringLiteral("homepath")), s_homepath);
 
     qputenv("WITHSLASH", "/a/");
diff --git a/src/core/kconfiggroup.cpp b/src/core/kconfiggroup.cpp
index 8b7cd863..f3ab2202 100644
--- a/src/core/kconfiggroup.cpp
+++ b/src/core/kconfiggroup.cpp
@@ -425,16 +425,13 @@ static QString translatePath(QString path) // krazy:exclude=passbyvalue
         return path;
     }
 
-    // we can not use KGlobal::dirs()->relativeLocation("home", path) here,
-    // since it would not recognize paths without a trailing '/'.
-    // All of the 3 following functions to return the user's home directory
-    // can return different paths. We have to test all them.
-    const QString homeDir0 = QFile::decodeName(qgetenv("HOME"));
-    const QString homeDir1 = QDir::homePath();
-    const QString homeDir2 = QDir(homeDir1).canonicalPath();
-    if (cleanHomeDirPath(path, homeDir0) || cleanHomeDirPath(path, homeDir1) || cleanHomeDirPath(path, homeDir2)) {
-        // qDebug() << "Path was replaced\n";
-    }
+    // Use the same thing as what expandString() will do, to keep data intact
+#ifdef Q_OS_WIN
+    const QString homeDir = QDir::homePath();
+#else
+    const QString homeDir = QFile::decodeName(qgetenv("HOME"));
+#endif
+    (void)cleanHomeDirPath(path, homeDir);
 
     if (startsWithFile) {
         path = QUrl::fromLocalFile(path).toString();