[pengfeixx]

test: add DevicePixel pageRect regression tests for BUG-380145

Add regression tests verifying pageRect(DevicePixel) unit consistency
with device-pixel margins across all three print paths (doPrint,
doPrintWithLargeDoc, asynPrint), preventing negative titleBox width
under Qt6 where pageRect(Point) no longer matches native DPI.

Log: Added GTest cases for DevicePixel pageRect fix in print paths.
Influence: None — test-only change, no production code modified.
PMS: BUG-380145

Summary by Sourcery

Tests:

• Add regression coverage for consistent DevicePixel page rectangles and margin calculations across synchronous, large-document, and asynchronous print paths.

[sourcery-ai]

Reviewer's Guide

Adds test-only GTest coverage for BUG-380145, using high-resolution PDF and image-backed printers to verify DevicePixel pageRect dimensions remain consistent with device-pixel margins and prevent negative title-box widths in doPrint, doPrintWithLargeDoc, and asynPrint.

File-Level Changes

Change	Details	Files
Added regression coverage for DevicePixel pageRect and device-pixel margin consistency across all print execution paths.	Exercises the standard doPrint path using a high-resolution PDF printer and verifies the print layout completes. Exercises the large-document print path with a populated print-document list and verifies processing completes. Exercises asynchronous printing with an image-backed painter and verifies rendering modifies the output. Checks that DevicePixel dimensions produce positive title-box width while the legacy Point dimensions reproduce the regression condition. Validates DevicePixel-to-Point sizing against the printer DPI in the asynchronous path.	tests/widgets_ut/test_window.cpp

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lzwind, pengfeixx

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