3 files changed, 9 insertions, 29 deletions
diff --git a/src/corelib/io/qdir.cpp b/src/corelib/io/qdir.cpp
index f10e1569473..a7e12eaae35 100644
--- a/src/corelib/io/qdir.cpp
+++ b/src/corelib/io/qdir.cpp
@@ -2223,16 +2223,12 @@ bool QDir::match(const QString &filter, const QString &fileName)
        "a/b/" and "a/b//../.." becomes "a/"), which matches the behavior
        observed in web browsers.
 
-    However, QUrl also uses local path mode for local URLs; with one exception:
-    Even in local mode we leave one trailing slash for paths ending in "/." if
-    the KeepLocalTrailingSlash flag is given. This reflects how QUrl needs to
-    treat local URLs due to compatibility constraints.
+    As a Qt extension, for local URLs we treat multiple slashes as one slash.
 */
 bool qt_normalizePathSegments(QString *path, QDirPrivate::PathNormalizations flags)
 {
     const bool allowUncPaths = flags.testAnyFlag(QDirPrivate::AllowUncPaths);
     const bool isRemote = flags.testAnyFlag(QDirPrivate::RemotePath);
-    const bool keepLocalTrailingSlash = flags.testAnyFlags(QDirPrivate::KeepLocalTrailingSlash);
     const qsizetype prefixLength = rootLength(*path, allowUncPaths);
 
     // RFC 3986 says: "The input buffer is initialized with the now-appended
@@ -2343,27 +2339,12 @@ bool qt_normalizePathSegments(QString *path, QDirPrivate::PathNormalizations fla
             ++in;       // the one dot
         }
 
-        if (out > start) {
-            // Always backtrack one slash
-            if (out[-1] == u'/' && in != end)
-                --out;
-
-            if (!isRemote) {
-                bool removedAnySlashes = false;
-
-                // Backtrack all slashes ...
-                while (out > start && out[-1] == u'/') {
-                    --out;
-                    removedAnySlashes = true;
-                }
-
-                // ... except a trailing one if it exists and flag given
-                if (removedAnySlashes && keepLocalTrailingSlash && out > start) {
-                    ++out;
-                    break;
-                }
-            }
-        }
+        // Not at 'end' yet, prepare for the next loop iteration by backtracking one slash.
+        // E.g.: /a/b/../c    >>> /a/b/../c
+        //          ^out            ^out
+        // the next iteration will copy '/c' to the output buffer >>> /a/c
+        if (in != end && out > start && out[-1] == u'/')
+            --out;
         if (out == start) {
             // We've reached the root. Make sure we don't turn a relative path
             // to absolute or, in the case of local paths that are already
diff --git a/src/corelib/io/qdir_p.h b/src/corelib/io/qdir_p.h
index 3641d003bec..36a20c64723 100644
--- a/src/corelib/io/qdir_p.h
+++ b/src/corelib/io/qdir_p.h
@@ -31,7 +31,6 @@ public:
         DefaultNormalization = 0x00,
         AllowUncPaths = 0x01,
         RemotePath = 0x02,
-        KeepLocalTrailingSlash = 0x04,
     };
     Q_DECLARE_FLAGS(PathNormalizations, PathNormalization)
     Q_FLAGS(PathNormalizations)
diff --git a/src/corelib/io/qurl.cpp b/src/corelib/io/qurl.cpp
index 2b34c6b8bcb..7bd2288b8af 100644
--- a/src/corelib/io/qurl.cpp
+++ b/src/corelib/io/qurl.cpp
@@ -913,7 +913,7 @@ inline void QUrlPrivate::appendPath(QString &appendTo, QUrl::FormattingOptions o
     if (options & QUrl::NormalizePathSegments) {
         qt_normalizePathSegments(
                 &thePath,
-                isLocalFile() ? QDirPrivate::KeepLocalTrailingSlash : QDirPrivate::RemotePath);
+                isLocalFile() ? QDirPrivate::DefaultNormalization : QDirPrivate::RemotePath);
     }
 
     QStringView thePathView(thePath);
@@ -2716,7 +2716,7 @@ QUrl QUrl::resolved(const QUrl &relative) const
 
     qt_normalizePathSegments(
             &t.d->path,
-            isLocalFile() ? QDirPrivate::KeepLocalTrailingSlash : QDirPrivate::RemotePath);
+            isLocalFile() ? QDirPrivate::DefaultNormalization : QDirPrivate::RemotePath);
     if (!t.d->hasAuthority())
         fixupNonAuthorityPath(&t.d->path);