ThePendulum
0a8f9f45bd
Removes PreviewDialog; the video area is now a QTabWidget with two tabs, each backed by its own independent, long-lived PlayerWidget/mpv instance: - Source: the main player (unchanged transport/marking controls below it still apply here). - Preview: a second player with its own minimal transport (play/pause + position label), auto-plays and switches to this tab as soon as a preview clip finishes building. The preview player persists for the whole session instead of being created per-preview -- building a new preview loads the new clip into the same mpv instance and only deletes the old temp file afterward (unsafe to unlink while mpv still has it open). Loading a new source file drops any existing preview, since it belonged to the previous file's offset. Found and fixed a real crash bug while testing the close-window path (not something the earlier popup-based tests exercised): closeEvent shut down both mpv instances but left the 100ms position-update QTimer running, so a tick landing between shutdown and process exit called get_position() on an already-terminated core and hard-crashed the process (native abort, not a catchable Python exception). Fixed by stopping the timer first in closeEvent. Verified on the virtual Xvfb display: automated test covers the tab switch, independent playback state between tabs, and temp-file lifecycle across rebuilding a preview and closing the window; also driven live with real xdotool clicks (mark both events, build preview, confirm auto-switch to the Preview tab with the clip already playing).