diff --git a/src/plugins/bazaar/annotationhighlighter.cpp b/src/plugins/bazaar/annotationhighlighter.cpp
index 8f99f9ec06a..7b5e2ba0208 100644
--- a/src/plugins/bazaar/annotationhighlighter.cpp
+++ b/src/plugins/bazaar/annotationhighlighter.cpp
@@ -19,7 +19,7 @@ QString BazaarAnnotationHighlighter::changeNumber(const QString &block) const
     const QRegularExpressionMatch match = m_changeset.match(block);
     if (match.hasMatch())
         return match.captured(1);
-    return QString();
+    return {};
 }
 
 } // Bazaar::Internal
diff --git a/src/plugins/bazaar/bazaarcommitwidget.cpp b/src/plugins/bazaar/bazaarcommitwidget.cpp
index 379fca66610..465395e0aef 100644
--- a/src/plugins/bazaar/bazaarcommitwidget.cpp
+++ b/src/plugins/bazaar/bazaarcommitwidget.cpp
@@ -159,7 +159,7 @@ QString BazaarCommitWidget::committer() const
     const QString author = m_bazaarCommitPanel->authorLineEdit->text();
     const QString email = m_bazaarCommitPanel->emailLineEdit->text();
     if (author.isEmpty())
-        return QString();
+        return {};
 
     QString user = author;
     if (!email.isEmpty()) {
diff --git a/src/plugins/bazaar/bazaareditor.cpp b/src/plugins/bazaar/bazaareditor.cpp
index 956ed6f28a9..146b2e71932 100644
--- a/src/plugins/bazaar/bazaareditor.cpp
+++ b/src/plugins/bazaar/bazaareditor.cpp
@@ -56,7 +56,7 @@ QString BazaarEditorWidget::changeUnderCursor(const QTextCursor &cursorIn) const
             }
         }
     }
-    return QString();
+    return {};
 }
 
 VcsBase::BaseAnnotationHighlighter *BazaarEditorWidget::createAnnotationHighlighter(const QSet<QString> &changes) const
diff --git a/src/plugins/bazaar/pullorpushdialog.cpp b/src/plugins/bazaar/pullorpushdialog.cpp
index 4c2cd99e7c5..1b607622369 100644
--- a/src/plugins/bazaar/pullorpushdialog.cpp
+++ b/src/plugins/bazaar/pullorpushdialog.cpp
@@ -112,7 +112,7 @@ PullOrPushDialog::~PullOrPushDialog() = default;
 QString PullOrPushDialog::branchLocation() const
 {
     if (m_defaultButton->isChecked())
-        return QString();
+        return {};
     if (m_localButton->isChecked())
         return m_localPathChooser->filePath().toString();
     return m_urlLineEdit->text();
diff --git a/src/plugins/cvs/cvseditor.cpp b/src/plugins/cvs/cvseditor.cpp
index 0a9298bd47e..d28144e3146 100644
--- a/src/plugins/cvs/cvseditor.cpp
+++ b/src/plugins/cvs/cvseditor.cpp
@@ -90,7 +90,7 @@ QString CvsEditorWidget::changeUnderCursor(const QTextCursor &c) const
         }
         break;
     }
-    return QString();
+    return {};
 }
 
 VcsBase::BaseAnnotationHighlighter *CvsEditorWidget::createAnnotationHighlighter(const QSet<QString> &changes) const
diff --git a/src/plugins/cvs/cvssubmiteditor.cpp b/src/plugins/cvs/cvssubmiteditor.cpp
index d5ecf9fcf4c..983dadaee32 100644
--- a/src/plugins/cvs/cvssubmiteditor.cpp
+++ b/src/plugins/cvs/cvssubmiteditor.cpp
@@ -29,7 +29,7 @@ QString CvsSubmitEditor::stateName(State st) const
     case LocallyRemoved:
         return m_msgRemoved;
     }
-    return QString();
+    return {};
 }
 
 void CvsSubmitEditor::setStateList(const StateFilePairs &statusOutput)
diff --git a/src/plugins/fossil/pullorpushdialog.cpp b/src/plugins/fossil/pullorpushdialog.cpp
index b6473a68b41..8c0df1dd522 100644
--- a/src/plugins/fossil/pullorpushdialog.cpp
+++ b/src/plugins/fossil/pullorpushdialog.cpp
@@ -82,7 +82,7 @@ PullOrPushDialog::PullOrPushDialog(Mode mode, QWidget *parent)
 QString PullOrPushDialog::remoteLocation() const
 {
     if (m_defaultButton->isChecked())
-        return QString();
+        return {};
     if (m_localButton->isChecked())
         return m_localPathChooser->filePath().toString();
     return m_urlLineEdit->text();
diff --git a/src/plugins/fossil/wizard/fossiljsextension.cpp b/src/plugins/fossil/wizard/fossiljsextension.cpp
index 9ca6b6e0bf0..aaf5d172b67 100644
--- a/src/plugins/fossil/wizard/fossiljsextension.cpp
+++ b/src/plugins/fossil/wizard/fossiljsextension.cpp
@@ -47,26 +47,17 @@ QString FossilJsExtension::displayName() const
 
 QString FossilJsExtension::defaultAdminUser() const
 {
-    if (!isConfigured())
-        return QString();
-
-    return settings().userName();
+    return isConfigured() ? settings().userName() : QString();
 }
 
 QString FossilJsExtension::defaultSslIdentityFile() const
 {
-    if (!isConfigured())
-        return QString();
-
-    return settings().sslIdentityFile().toFSPathString();
+    return isConfigured() ? settings().sslIdentityFile().toFSPathString() : QString();
 }
 
 QString FossilJsExtension::defaultLocalRepoPath() const
 {
-    if (!isConfigured())
-        return QString();
-
-    return settings().defaultRepoPath().toFSPathString();
+    return isConfigured() ? settings().defaultRepoPath().toFSPathString() : QString();
 }
 
 bool FossilJsExtension::defaultDisableAutosync() const
diff --git a/src/plugins/mercurial/annotationhighlighter.cpp b/src/plugins/mercurial/annotationhighlighter.cpp
index be2259182f0..ec75322a71e 100644
--- a/src/plugins/mercurial/annotationhighlighter.cpp
+++ b/src/plugins/mercurial/annotationhighlighter.cpp
@@ -18,7 +18,7 @@ QString MercurialAnnotationHighlighter::changeNumber(const QString &block) const
     const QRegularExpressionMatch match = changeset.match(block);
     if (match.hasMatch())
         return match.captured(1);
-    return QString();
+    return {};
 }
 
 } // Mercurial::Internal
diff --git a/src/plugins/mercurial/mercurialcommitwidget.cpp b/src/plugins/mercurial/mercurialcommitwidget.cpp
index c6b35a67d08..d1d1a7b37b9 100644
--- a/src/plugins/mercurial/mercurialcommitwidget.cpp
+++ b/src/plugins/mercurial/mercurialcommitwidget.cpp
@@ -151,7 +151,7 @@ QString MercurialCommitWidget::committer() const
     const QString author = mercurialCommitPanel->m_authorLineEdit->text();
     const QString email = mercurialCommitPanel->m_emailLineEdit->text();
     if (author.isEmpty())
-        return QString();
+        return {};
 
     QString user = author;
     if (!email.isEmpty()) {
diff --git a/src/plugins/mercurial/mercurialeditor.cpp b/src/plugins/mercurial/mercurialeditor.cpp
index 19e1921e02c..b08802b8d66 100644
--- a/src/plugins/mercurial/mercurialeditor.cpp
+++ b/src/plugins/mercurial/mercurialeditor.cpp
@@ -45,7 +45,7 @@ QString MercurialEditorWidget::changeUnderCursor(const QTextCursor &cursorIn) co
         if (exactIdentifier40.match(change).hasMatch())
             return change;
     }
-    return QString();
+    return {};
 }
 
 VcsBase::BaseAnnotationHighlighter *MercurialEditorWidget::createAnnotationHighlighter(const QSet<QString> &changes) const
diff --git a/src/plugins/perforce/perforceeditor.cpp b/src/plugins/perforce/perforceeditor.cpp
index ec418a7cedd..623ac1ed8fe 100644
--- a/src/plugins/perforce/perforceeditor.cpp
+++ b/src/plugins/perforce/perforceeditor.cpp
@@ -46,7 +46,7 @@ QString PerforceEditorWidget::changeUnderCursor(const QTextCursor &c) const
     // Any number is regarded as change number.
     cursor.select(QTextCursor::WordUnderCursor);
     if (!cursor.hasSelection())
-        return QString();
+        return {};
     const QString change = cursor.selectedText();
     return m_changeNumberPattern.match(change).hasMatch() ? change : QString();
 }
diff --git a/src/plugins/perforce/perforceplugin.cpp b/src/plugins/perforce/perforceplugin.cpp
index 2a9905a4c22..64ad692c889 100644
--- a/src/plugins/perforce/perforceplugin.cpp
+++ b/src/plugins/perforce/perforceplugin.cpp
@@ -1589,7 +1589,7 @@ QString PerforcePluginPrivate::clientFilePath(const QString &serverFilePath)
     const PerforceResponse response = runP4Cmd(m_settings.topLevelSymLinkTarget(), args,
                                                ShowBusyCursor|RunFullySynchronous|CommandToWindow|StdErrToWindow|ErrorToWindow);
     if (response.error)
-        return QString();
+        return {};
 
     const QRegularExpression r("\\.\\.\\.\\sclientFile\\s(.+?)\n");
     const QRegularExpressionMatch match = r.match(response.stdOut);
@@ -1604,14 +1604,14 @@ QString PerforcePluginPrivate::pendingChangesData()
     const PerforceResponse userResponse = runP4Cmd(m_settings.topLevelSymLinkTarget(), args,
                                                RunFullySynchronous|CommandToWindow|StdErrToWindow|ErrorToWindow);
     if (userResponse.error)
-        return QString();
+        return {};
 
     const QRegularExpression r("User\\sname:\\s(\\S+?)\\s*?\n");
     QTC_ASSERT(r.isValid(), return QString());
     const QRegularExpressionMatch match = r.match(userResponse.stdOut);
     const QString user = match.hasMatch() ? match.captured(1).trimmed() : QString();
     if (user.isEmpty())
-        return QString();
+        return {};
     args.clear();
     args << QLatin1String("changes") << QLatin1String("-s") << QLatin1String("pending") << QLatin1String("-u") << user;
     const PerforceResponse dataResponse = runP4Cmd(m_settings.topLevelSymLinkTarget(), args,
@@ -1644,7 +1644,7 @@ QString PerforcePlugin::fileNameFromPerforceName(const QString& perforceName,
     const PerforceResponse response = dd->runP4Cmd(dd->m_settings.topLevelSymLinkTarget(), args, flags);
     if (response.error) {
         *errorMessage = msgWhereFailed(perforceName, response.message);
-        return QString();
+        return {};
     }
 
     QString output = response.stdOut;
@@ -1656,7 +1656,7 @@ QString PerforcePlugin::fileNameFromPerforceName(const QString& perforceName,
     if (output.isEmpty()) {
         //: File is not managed by Perforce
         *errorMessage = msgWhereFailed(perforceName, Tr::tr("The file is not mapped"));
-        return QString();
+        return {};
     }
     const QString p4fileSpec = output.mid(output.lastIndexOf(QLatin1Char(' ')) + 1);
     return dd->m_settings.mapToFileSystem(p4fileSpec);
diff --git a/src/plugins/subversion/subversionclient.cpp b/src/plugins/subversion/subversionclient.cpp
index 0e47c584542..5bb2a3eac2f 100644
--- a/src/plugins/subversion/subversionclient.cpp
+++ b/src/plugins/subversion/subversionclient.cpp
@@ -89,7 +89,7 @@ Id SubversionClient::vcsEditorKind(VcsCommandTag cmd) const
     case VcsBaseClient::LogCommand: return Constants::SUBVERSION_LOG_EDITOR_ID;
     case VcsBaseClient::AnnotateCommand: return Constants::SUBVERSION_BLAME_EDITOR_ID;
     default:
-        return Id();
+        return {};
     }
 }
 
diff --git a/src/plugins/subversion/subversioneditor.cpp b/src/plugins/subversion/subversioneditor.cpp
index c54371c7867..4549c6e14da 100644
--- a/src/plugins/subversion/subversioneditor.cpp
+++ b/src/plugins/subversion/subversioneditor.cpp
@@ -46,7 +46,7 @@ QString SubversionEditorWidget::changeUnderCursor(const QTextCursor &c) const
     // Any number is regarded as change number.
     cursor.select(QTextCursor::LineUnderCursor);
     if (!cursor.hasSelection())
-        return QString();
+        return {};
     const QString change = cursor.selectedText();
     const int pos = c.position() - cursor.selectionStart() + 1;
     // Annotation output has number, log output has revision numbers,
@@ -72,7 +72,7 @@ QString SubversionEditorWidget::changeUnderCursor(const QTextCursor &c) const
         if (pos > start && pos <= end)
             return rev;
     }
-    return QString();
+    return {};
 }
 
 VcsBase::BaseAnnotationHighlighter *SubversionEditorWidget::createAnnotationHighlighter(const QSet<QString> &changes) const
diff --git a/src/plugins/subversion/subversionplugin.cpp b/src/plugins/subversion/subversionplugin.cpp
index 7ddcb0ddf6c..fb6fca48d4f 100644
--- a/src/plugins/subversion/subversionplugin.cpp
+++ b/src/plugins/subversion/subversionplugin.cpp
@@ -994,7 +994,7 @@ QString SubversionPluginPrivate::monitorFile(const FilePath &repository) const
                 return fi.absoluteFilePath();
         }
     }
-    return QString();
+    return {};
 }
 
 QString SubversionPluginPrivate::synchronousTopic(const FilePath &repository) const