Selecting a layer is not a history step, so each state kept the target it
had when it was created. Undoing a step therefore jumped back to whatever
was selected when the previous step was taken: rasterize a shape with the
Background active, select the rasterized layer, paint, Ctrl+Z, and the
Background became active again.
The state a step leaves behind now targets what was selected just before
the step (Session::edit and compound steps set the current state's target
before recording), as in Photoshop: undo of a stroke or fill keeps the
painted layer, undo of New Layer or Merge goes back to the layers selected
before it.
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Nigel Ihza Firdausy