Core: Remove redundant spacers from Expression editor

src/Gui/Dialogs/DlgExpressionInput.cpp

@@ -119,7 +119,6 @@ DlgExpressionInput::DlgExpressionInput(const App::ObjectIdentifier & _path,
         ui->msg->setWordWrap(true);
         ui->msg->setMaximumHeight(200);
         ui->msg->setMinimumWidth(280);
-        ui->horizontalSpacer_3->changeSize(0, 2);
         ui->verticalLayout->setContentsMargins(9, 9, 9, 9);
         this->adjustSize();
         // It is strange that (at least on Linux) DlgExpressionInput will shrink

src/Gui/Dialogs/DlgExpressionInput.ui

@@ -173,19 +173,6 @@
        </property>
       </widget>
      </item>
-     <item>
-      <spacer name="horizontalSpacer_3">
-       <property name="orientation">
-        <enum>Qt::Orientation::Horizontal</enum>
-       </property>
-       <property name="sizeHint" stdset="0">
-        <size>
-         <width>0</width>
-         <height>2</height>
-        </size>
-       </property>
-      </spacer>
-     </item>
     </layout>
    </item>
    <item>