WIP for block rotate and mirror.

Block rotate now doesn't drop the block, but it does introduce one
extra undo step per rotate.

Fixes: lp:1780794
* https://bugs.launchpad.net/kicad/+bug/1780794

eeschema/block.cpp

@@ -115,7 +115,7 @@ void SCH_EDIT_FRAME::HandleBlockPlace( wxDC* DC )
         wxString msg;
         msg.Printf( wxT( "HandleBlockPLace() error : no items to place (cmd %d, state %d)" ),
                     block->GetCommand(), block->GetState() );
-        DisplayError( this, msg );
+        wxFAIL_MSG( msg );
     }
 
     block->SetState( STATE_BLOCK_STOP );
@@ -193,7 +193,6 @@ bool SCH_EDIT_FRAME::HandleBlockEnd( wxDC* aDC )
     bool            append = false;
     BLOCK_SELECTOR* block = &GetScreen()->m_BlockLocate;
 
-
     auto panel =static_cast<SCH_DRAW_PANEL*>(m_canvas);
     auto view = panel->GetView();
     auto area = view->GetSelectionArea();

eeschema/schedit.cpp

@@ -842,13 +842,18 @@ void SCH_EDIT_FRAME::OnRotate( wxCommandEvent& aEvent )
     SCH_SCREEN* screen = GetScreen();
     SCH_ITEM*   item = screen->GetCurItem();
 
-//    INSTALL_UNBUFFERED_DC( dc, m_canvas );
-    printf("OnRotate\n");
     // Allows block rotate operation on hot key.
     if( screen->m_BlockLocate.GetState() != STATE_NO_BLOCK )
     {
-        screen->m_BlockLocate.SetCommand( BLOCK_ROTATE );
-        HandleBlockEnd( nullptr );
+        // Compute the rotation center and put it on grid:
+        wxPoint rotationPoint = screen->m_BlockLocate.Centre();
+        rotationPoint = GetNearestGridPosition( rotationPoint );
+        SetCrossHairPosition( rotationPoint );
+
+        SaveCopyInUndoList( screen->m_BlockLocate.GetItems(), UR_ROTATED, false, rotationPoint );
+        RotateListOfItems( screen->m_BlockLocate.GetItems(), rotationPoint );
+        
+        m_canvas->CallMouseCapture( nullptr, wxDefaultPosition, false );
         return;
     }