AutomataLab v2.1.1

Added

• Redesigned file controls — dedicated New / Open / Save toolbar buttons (with Save As… and a Recent files menu) replacing the old FILE dropdown, plus standard shortcuts Ctrl/Cmd+N/O/S/Shift+S and Ctrl+T / Ctrl+W for tabs.
• Unsaved-changes guard — closing the app (or a tab) with unsaved work now prompts Save All / Discard / Cancel instead of losing it silently, and the title shows a “●” dot while there are unsaved changes.
• Simulation Step Back (⏮ / ←) to retrace one step of a run.
• Interactive minimap — pan, scroll to zoom, and click to recenter.

Changed

• Auto-layout rebuilt on ELK “stress” for compact, roughly-symmetric, deterministic arrangements with no overlapping states (start state on the left); text notes stay put.
• Fit-view frames the whole machine — self-loops and curved transition edges are included, not just the state boxes.
• Opening a file never clobbers unsaved work — it reuses an empty tab or opens a new one; Save writes in place once a file’s path is known.
• The machine-name field now reads as editable (bordered with a hover/focus highlight).

Fixed

• Deleting a transition edge that bundles several transitions (common for PDAs) now removes the whole edge instead of leaving a “ghost”; editing such an edge’s label updates it consistently.
• Pressing Play no longer leaves the input briefly editable / out of sync at the start of a run.
• Copy/paste now preserves PDA stack operations (read / pop / push).
• Graph edits are disabled during a running simulation, and transitions whose endpoints were removed no longer render as broken edges.
• Smaller fixes: Escape cancels inline label editing cleanly, the computation-tree selection resets on a new run, drag interactions clean up reliably, and toast durations are guarded against bad values.