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Move BooruApp from app.py to main_window.py (no behavior change)

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Step 12 of the gui/app.py + gui/preview.py structural refactor — the
biggest single move out of app.py. The entire ~3020-line BooruApp
QMainWindow class moves to its own module under gui/. The class body
is byte-identical: every method, every signal connection, every
private attribute access stays exactly as it was.

main_window.py imports the helper classes that already moved out of
app.py (SearchState, LogHandler, AsyncSignals, InfoPanel) directly
from their canonical sibling modules at the top of the file, so the
bare-name lookups inside BooruApp method bodies (`SearchState(...)`,
`LogHandler(self._log_text)`, `AsyncSignals()`, `InfoPanel()`) keep
resolving to the same class objects. Same package depth as app.py
was, so no relative-import depth adjustment is needed for any of
the lazy `..core.X` or `.preview` imports inside method bodies —
they keep working through the preview.py shim until commit 14
swaps them to canonical paths.

app.py grows the BooruApp re-export shim line. After this commit
app.py is just imports + log + the four helpers (run,
_apply_windows_dark_mode, _load_user_qss, _BASE_POPOUT_OVERLAY_QSS)
+ the shim block. Commit 13 carves the helpers out, commit 14
deletes the shims and the file.

VERIFICATION: full method-cluster sweep (see docs/REFACTOR_PLAN.md
"Commit 12 expanded verification" section), not the 7-item smoke test.
This commit is contained in:
pax 2026-04-08 14:42:16 -05:00
parent eded7790af
commit da36c4a8f2
2 changed files with 3088 additions and 3025 deletions
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