tests: add testing for diff.showfunc The diff.showfunc config knob did not have coverage before.

manifest: make manifest.intersectfiles() internal manifest.intersectfiles() is just a utility used by manifest.matches(), and a future commit removes intersectfiles for treemanifest for optimization purposes. This commit makes the intersectfiles methods on manifestdict and treemanifest internal, and converts its test to a more generic testMatches(), which has the exact same coverage.

win32: add comment about WinError Prevent reintroducing the bug that was added in e34106fa0dc3 (and fixed with a2285e2fc949).

templates: fix "log -q" output of phases style It had the same problem as 6136704b975d, name conflicts of {node} keyword.

record_curses: fix ui bug for newly added file With record's curses interface toggling and untoggling a newly added file would lead to a confusing UI (the header was marked as partial and the hunks as unselected). Tested additionally using the curses interface with newly added, removed and modified files in a test repo.

import-checker: rotatecycle is actually the canonical cycle key So refactor to drop cyclekey().