Put up infobar when editing board footprint.

Fixes https://gitlab.com/kicad/code/kicad/issues/5294

eeschema/libedit/lib_edit_frame.cpp

@@ -593,6 +593,18 @@ void LIB_EDIT_FRAME::SetCurPart( LIB_PART* aPart )
     // Ensure synchronized pin edit can be enabled only symbols with interchangeable units
     m_SyncPinEdit = aPart && aPart->IsRoot() && aPart->IsMulti() && !aPart->UnitsLocked();
 
+    /* TODO: enable when we have schematic-symbol editing...
+    if( IsCurrentPartFromSchematic() )
+    {
+        wxString msg;
+        msg.Printf( _( "Editing %s from schematic.  Saving will update the schematic only." ),
+                    partName );
+
+        GetInfoBar()->RemoveAllButtons();
+        GetInfoBar()->ShowMessage( msg, wxICON_INFORMATION );
+    }
+     */
+
     m_toolManager->ResetTools( TOOL_BASE::MODEL_RELOAD );
     RebuildView();
 }

pcbnew/footprint_edit_frame.cpp

@@ -406,6 +406,16 @@ void FOOTPRINT_EDIT_FRAME::AddModuleToBoard( MODULE* aFootprint )
 
     PCB_BASE_EDIT_FRAME::AddModuleToBoard( aFootprint );
 
+    if( IsCurrentFPFromBoard() )
+    {
+        wxString msg;
+        msg.Printf( _( "Editing %s from board.  Saving will update the board only." ),
+                    aFootprint->GetReference() );
+
+        GetInfoBar()->RemoveAllButtons();
+        GetInfoBar()->ShowMessage( msg, wxICON_INFORMATION );
+    }
+
     UpdateMsgPanel();
 }