Clone Stamp Tool - Selected layers mode
It would be beneficial to incorporate an additional functionality within the clone stamp tool, allowing it to sample across all currently selected layers.
An instance where this feature would be particularly useful is during the application of the frequency separation technique. In this scenario, one may create a new empty layer positioned atop the "high" layer, utilizing a clipping mask to confine its effect to the "high" layer. Subsequently, one would aim to select both the "high" layer and the newly created empty layer, enabling the clone stamp tool to exclusively sample from these two layers while maintaining visibility of underlying layers.
