Set placeholder text to original artist/album/etc

gui/tageditor.cpp

@@ -442,6 +442,7 @@ void TagEditor::setIndex(int idx)
     Song s=edited.at(!haveMultiple || idx==0 ? 0 : idx);
     setSong(s);
     currentSongIndex=idx;
+    setPlaceholderTexts();
 
     bool isMultiple=haveMultiple && 0==idx;
     title->setEnabled(!isMultiple);
@@ -496,6 +497,32 @@ void TagEditor::applyUpdates()
     }
 }
 
+void TagEditor::setPlaceholderTexts()
+{
+    bool isAll=0==currentSongIndex && original.count()>1;
+
+    if (isAll) {
+        Song all=original.at(0);
+        if (!all.artist.isEmpty()) {
+            artist->setPlaceholderText(all.artist);
+        }
+        if (!all.album.isEmpty()) {
+            album->setPlaceholderText(all.album);
+        }
+        if (!all.albumartist.isEmpty()) {
+            albumArtist->setPlaceholderText(all.albumartist);
+        }
+        if (!all.genre.isEmpty()) {
+            genre->setPlaceholderText(all.genre);
+        }
+    } else {
+         artist->setPlaceholderText(QString());
+         album->setPlaceholderText(QString());
+         albumArtist->setPlaceholderText(QString());
+         genre->setPlaceholderText(QString());
+    }
+}
+
 #ifdef ENABLE_KDE_SUPPORT
 void TagEditor::slotButtonClicked(int button)
 {

gui/tageditor.h

@@ -65,6 +65,7 @@ private:
     void updateTrackName(int index, bool edited);
     void updateEditedStatus(int index);
     void applyUpdates();
+    void setPlaceholderTexts();
 
 private Q_SLOTS:
     void applyVa();

widgets/completioncombo.h

@@ -61,6 +61,10 @@ public:
     QString text() const {
         return qobject_cast<KLineEdit*>(lineEdit())->text();
     }
+
+    void setPlaceholderText(const QString &text) {
+        qobject_cast<KLineEdit*>(lineEdit())->setPlaceholderText(text);
+    }
 };
 #else
 #include <QtGui/QComboBox>
@@ -83,6 +87,10 @@ public:
     QString text() const {
         return qobject_cast<QLineEdit*>(lineEdit())->text();
     }
+
+    void setPlaceholderText(const QString &text) {
+        qobject_cast<QLineEdit*>(lineEdit())->setPlaceholderText(text);
+    }
 };
 #endif