Utils: Introduce Layouting::{br,st}

... as "standard" ways to define line breaks and simple stretch.

There have already been too many patterns to do it.

Break() and Stretch() still work for the patches in flight, but
they are planned to be removed.

Change-Id: I9b70dcdc11244a904a496b0c55938dfb0b265fc8
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/docker/dockerdevicewidget.cpp

@@ -177,15 +177,15 @@ DockerDeviceWidget::DockerDeviceWidget(const IDevice::Ptr &device)
     using namespace Layouting;
 
     Form {
-        repoLabel, m_repoLineEdit, Break(),
-        tagLabel, m_tagLineEdit, Break(),
-        idLabel, m_idLineEdit, Break(),
-        daemonStateLabel, m_daemonReset, m_daemonState, Break(),
-        m_runAsOutsideUser, Break(),
+        repoLabel, m_repoLineEdit, br,
+        tagLabel, m_tagLineEdit, br,
+        idLabel, m_idLineEdit, br,
+        daemonStateLabel, m_daemonReset, m_daemonState, br,
+        m_runAsOutsideUser, br,
         Column {
             pathListLabel,
             m_pathsListEdit,
-        }, Break(),
+        }, br,
         Column {
             Space(20),
             Row {
@@ -196,9 +196,9 @@ DockerDeviceWidget::DockerDeviceWidget(const IDevice::Ptr &device)
                 autoDetectButton,
                 undoAutoDetectButton,
                 listAutoDetectedButton,
-                Stretch(),
+                st,
             },
-            new QLabel(Tr::tr("Detection log:")),
+            Tr::tr("Detection log:"),
             logView
         }
     }.attachTo(this);