Plugins: use const (and const APIs) more

For CoW types, prefer const methods to avoid needless detach()ing.

Change-Id: I625d57c0c19e87ac2de681bb16d0cc5a7a59b366
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

2 files changed, 2 insertions, 2 deletions

diff --git a/src/plugins/platforms/xcb/qxcbmime.cpp b/src/plugins/platforms/xcb/qxcbmime.cpp
index 3643b3e975..7592eb2887 100644
--- a/src/plugins/platforms/xcb/qxcbmime.cpp
+++ b/src/plugins/platforms/xcb/qxcbmime.cpp
@@ -220,7 +220,7 @@ QVariant QXcbMime::mimeConvertToFormat(QXcbConnection *connection, xcb_atom_t a,
                     // The atomName variable is not used because mimeAtomToString()
                     // converts "text/x-moz-url" to "text/uri-list".
                     if (!list.isEmpty() && connection->atomName(a) == "text/x-moz-url")
-                        return list.first();
+                        return list.constFirst();
                     return list;
                 } else {
                     return str;
diff --git a/src/plugins/platforms/xcb/qxcbsessionmanager.cpp b/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
index 8744fcba3e..2303ccf806 100644
--- a/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
+++ b/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
@@ -146,7 +146,7 @@ static void sm_setProperty(const QString &name, const QStringList &value)
     for (QStringList::ConstIterator it = value.begin(); it != value.end(); ++it) {
       prop[count].length = (*it).length();
       vl.append((*it).toUtf8());
-      prop[count].value = (char*)vl.last().data();
+      prop[count].value = (char*)vl.constLast().data();
       ++count;
     }
     sm_setProperty(name.toLatin1().data(), SmLISTofARRAY8, count, prop);