pcbnew: retain selection between edits

We had been deselecting items after calling edits to be safe in case the
item was deleted/exchanged by the edit.  The item pointer itself remains
valid even when deleting as it is assigned to the undo stack.  But it
should not remain visible or selected on the schematic if it is removed.

This tests for removed items by checking whether it (in the case of
first-level BOARD_ITEMS) or its parent (in the case of footprint item
components) remain in the view list after editing.  If they are still in
the view list, then we re-select them.

Fixes: lp:1765774
* https://bugs.launchpad.net/kicad/+bug/1765774

Fixes: lp:1775946
* https://bugs.launchpad.net/kicad/+bug/1775946

pcbnew/board_commit.cpp

@@ -30,6 +30,7 @@
 #include <view/view.h>
 #include <board_commit.h>
 #include <tools/pcb_tool.h>
+#include <tools/pcb_actions.h>
 #include <connectivity_data.h>
 
 #include <functional>
@@ -186,6 +187,9 @@ void BOARD_COMMIT::Push( const wxString& aMessage, bool aCreateUndoEntry, bool a
                     {
                         view->Remove( boardItem );
 
+                        // Removing an item should trigger the unselect
+                        m_toolMgr->RunAction( PCB_ACTIONS::unselectItem, true, boardItem );
+
                         if( !( changeFlags & CHT_DONE ) )
                         {
                             MODULE* module = static_cast<MODULE*>( boardItem->GetParent() );

pcbnew/tools/edit_tool.cpp

@@ -676,24 +676,22 @@ int EDIT_TOOL::Properties( const TOOL_EVENT& aEvent )
         // Display properties dialog
         BOARD_ITEM* item = static_cast<BOARD_ITEM*>( selection.Front() );
 
-        // Some of properties dialogs alter pointers, so we should deselect them
-        m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );
-
-        // Store flags, so they can be restored later
-        STATUS_FLAGS flags = item->GetFlags();
-        item->ClearFlags();
-
         // Do not handle undo buffer, it is done by the properties dialogs @todo LEGACY
         // Display properties dialog provided by the legacy canvas frame
         editFrame->OnEditItemRequest( NULL, item );
 
+        // Notify other tools of the changes
         m_toolMgr->RunAction( PCB_ACTIONS::selectionModified, true );
-        item->SetFlags( flags );
     }
 
     if( selection.IsHover() )
+    {
         m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );
 
+        // Notify other tools of the changes -- This updates the visual ratsnest
+        m_toolMgr->RunAction( PCB_ACTIONS::selectionModified, true );
+    }
+
     return 0;
 }