Fix tooltip for scale from canvas button

Author: nyalldawson

src/gui/qgsscalewidget.cpp

@@ -32,6 +32,7 @@ QgsScaleWidget::QgsScaleWidget( QWidget *parent )
   layout->addWidget( mScaleComboBox );
 
   mCurrentScaleButton = new QToolButton( this );
+  mCurrentScaleButton->setToolTip( tr("Set to current canvas scale") );
   mCurrentScaleButton->setIcon( QgsApplication::getThemeIcon( "/mActionMapIdentification.svg" ) );
   layout->addWidget( mCurrentScaleButton );
   mCurrentScaleButton->hide();

src/ui/qgsvectorlayerpropertiesbase.ui

@@ -488,12 +488,6 @@
                  <layout class="QGridLayout" name="gridLayout_6">
                   <item row="0" column="0">
                    <widget class="QgsScaleRangeWidget" name="mScaleRangeWidget" native="true">
-                    <property name="toolTip">
-                     <string>A widget to define the scale visibility</string>
-                    </property>
-                    <property name="whatsThis">
-                     <string>A widget to define the scale visibility.</string>
-                    </property>
                    </widget>
                   </item>
                  </layout>