debug: MUX_DUMP writes one frame from the pixmap, then exits

Verifying what the program actually draws by screenshotting its window is
unreliable: X does not retain a window's contents while it is obscured or
on an unfocused tag, so import and xwd can both return solid black while
the rendering is correct. Reading back the off-screen pixmap always
works.

Used to confirm the XRectangle clip-truncation fix: rows now run
unbroken from 2027-01-01 to 2027-01-29 with every column populated,
where before the twelfth row lost everything but its name.

0 files changed, 0 insertions, 0 deletions