Vaadin Framework 8.8.6

Vaadin Framework 8.8.6 is a maintenance release with the following fixes :

• Fix ListSelect bug when using shift for multi-select
• Fix upload bug when calling disabled from succeedListener with Push enabled
• Apply offset to column index depending on presence of selection column
• Changed the handleSessionExpired logic to return a 404 instead of a 410
• Ensure that VComboBox.selectedOptionKey gets initial selection

See the complete list of changes since 8.8.5