Ensure dimension units are updated when being placed

* Fix the display of dimension units in the properties dialog. It was
  previously not showing automatic units in the dialog.
* When placing dimension items (e.g. from paste or append), update the
  units to the board units when the dimension uses automatic units.

Fixes https://gitlab.com/kicad/code/kicad/issues/6267

pcbnew/dialogs/dialog_dimension_properties.cpp

@@ -181,10 +181,14 @@ bool DIALOG_DIMENSION_PROPERTIES::TransferDataToWindow()
     m_txtValue->Enable( m_dimension->GetOverrideTextEnabled() );
     m_cbOverrideValue->SetValue( m_dimension->GetOverrideTextEnabled() );
 
-    EDA_UNITS  units;
-    m_dimension->GetUnits( units );
+    switch( m_dimension->GetUnitsMode() )
+    {
+        case DIM_UNITS_MODE::INCHES:        m_cbUnits->SetSelection( 0 ); break;
+        case DIM_UNITS_MODE::MILS:          m_cbUnits->SetSelection( 1 ); break;
+        case DIM_UNITS_MODE::MILLIMETRES:   m_cbUnits->SetSelection( 2 ); break;
+        case DIM_UNITS_MODE::AUTOMATIC:     m_cbUnits->SetSelection( 3 ); break;
+    }
 
-    m_cbUnits->SetSelection( units == EDA_UNITS::MILLIMETRES ? 2 : units == EDA_UNITS::MILS ? 1 : 0 );
     m_cbUnitsFormat->SetSelection( static_cast<int>( m_dimension->GetUnitsFormat() ) );
     m_cbPrecision->SetSelection( static_cast<int>( m_dimension->GetPrecision() ) );
 
@@ -298,8 +302,26 @@ void DIALOG_DIMENSION_PROPERTIES::updateDimensionFromDialog( DIMENSION* aTarget
     aTarget->SetSuffix( board->ConvertCrossReferencesToKIIDs( m_txtSuffix->GetValue() ) );
     aTarget->SetLayer( static_cast<PCB_LAYER_ID>( m_cbLayerActual->GetLayerSelection() ) );
 
-    aTarget->SetUnits( m_frame->GetUserUnits() );
-    aTarget->SetUnitsMode( static_cast<DIM_UNITS_MODE>( m_cbUnits->GetSelection() ) );
+    switch( m_cbUnits->GetSelection() )
+    {
+        case 0:
+            aTarget->SetUnitsMode( DIM_UNITS_MODE::INCHES );
+            break;
+
+        case 1:
+            aTarget->SetUnitsMode( DIM_UNITS_MODE::MILS );
+            break;
+
+        case 2:
+            aTarget->SetUnitsMode( DIM_UNITS_MODE::MILLIMETRES );
+            break;
+
+        case 3:
+            aTarget->SetUnitsMode( DIM_UNITS_MODE::AUTOMATIC );
+            aTarget->SetUnits( m_frame->GetUserUnits() );
+            break;
+    }
+
     aTarget->SetUnitsFormat( static_cast<DIM_UNITS_FORMAT>( m_cbUnitsFormat->GetSelection() ) );
     aTarget->SetPrecision( m_cbPrecision->GetSelection() );
     aTarget->SetSuppressZeroes( m_cbSuppressZeroes->GetValue() );

pcbnew/edit.cpp

@@ -149,7 +149,8 @@ void PCB_EDIT_FRAME::OnEditItemRequest( BOARD_ITEM* aItem )
         ShowTextPropertiesDialog( aItem );
         break;
 
-    case PCB_SHAPE_T:ShowGraphicItemPropertiesDialog( aItem );
+    case PCB_SHAPE_T:
+        ShowGraphicItemPropertiesDialog( aItem );
         break;
 
     case PCB_ZONE_AREA_T:

pcbnew/tools/pcbnew_control.cpp

@@ -33,6 +33,7 @@
 #include <board_commit.h>
 #include <class_board.h>
 #include <class_board_item.h>
+#include <class_dimension.h>
 #include <class_module.h>
 #include <class_track.h>
 #include <class_zone.h>
@@ -861,15 +862,37 @@ int PCBNEW_CONTROL::placeBoardItems( std::vector<BOARD_ITEM*>& aItems, bool aIsN
         {
             const_cast<KIID&>( item->m_Uuid ) = KIID();
 
-            if( item->Type() == PCB_MODULE_T )
-            {
-                static_cast<MODULE*>( item )->SetPath( KIID_PATH() );
-            }
-
             if( selectionTool->GetEnteredGroup() && !item->GetParentGroup() )
-            {
                 selectionTool->GetEnteredGroup()->AddItem( item );
+        }
+
+        // Update item attributes if needed
+        switch( item->Type() )
+        {
+        case PCB_DIMENSION_T:
+        case PCB_DIM_ALIGNED_T:
+        case PCB_DIM_CENTER_T:
+        case PCB_DIM_ORTHOGONAL_T:
+        case PCB_DIM_LEADER_T:
+            {
+            // Dimensions need to have their units updated if they are automatic
+            DIMENSION* dim = static_cast<DIMENSION*>( item );
+
+            if( dim->GetUnitsMode() == DIM_UNITS_MODE::AUTOMATIC )
+                dim->SetUnits( frame()->GetUserUnits() );
+
+            break;
             }
+
+        case PCB_MODULE_T:
+            // Update the module path with the new KIID path if the module is new
+            if( aIsNew )
+                static_cast<MODULE*>( item )->SetPath( KIID_PATH() );
+
+            break;
+
+        default:
+            break;
         }
 
         // Add or just select items for the move/place command