Pcbnew, DIALOG_PAD_PROPERTIES: ensure the right spoke angle is displayed.

Previously it was sometimes the default value, not the initial value when
opening the dialog.
Fixes #15410
https://gitlab.com/kicad/code/kicad/-/issues/15410

pcbnew/dialogs/dialog_pad_properties.cpp

@@ -592,6 +592,10 @@ void DIALOG_PAD_PROPERTIES::initValues()
         m_trapAxisCtrl->SetSelection( 1 );
     }
 
+    // Store the initial thermal spoke angle to restore it, because some initializations
+    // can change this value (mainly after m_PadShapeSelector initializations)
+    EDA_ANGLE spokeInitialAngle = m_previewPad->GetThermalSpokeAngle();
+
     m_padToDieOpt->SetValue( m_previewPad->GetPadToDieLength() != 0 );
     m_padToDie.ChangeValue( m_previewPad->GetPadToDieLength() );
 
@@ -721,6 +725,11 @@ void DIALOG_PAD_PROPERTIES::initValues()
     OnPadShapeSelection( cmd_event );
     OnOffsetCheckbox( cmd_event );
 
+    // Restore thermal spoke angle to its initial value, because it can be modified
+    // by the call to OnPadShapeSelection()
+    m_previewPad->SetThermalSpokeAngle( spokeInitialAngle );
+    m_spokeAngle.SetAngleValue( m_previewPad->GetThermalSpokeAngle() );
+
     // Update basic shapes list
     displayPrimitivesList();
 }