Eugene Petrenko 521cc16e44 Add optional @PPI hint to --display for HiDPI pixel displays ... `tart set --display WIDTHxHEIGHTpx` always configured the guest's pixel framebuffer at a hardcoded 72 PPI, so a macOS guest never exposed a HiDPI (2x/Retina) mode when the host display was non-Retina — or absent, which is common on headless/CI hosts. There was no way to ask for a Retina guest in that case. Allow an optional "@PPI" pixels-per-inch suffix on --display, e.g. `--display 3200x1800px@220`. At a Retina-class density the pixel display then offers a scaling:on (HiDPI) mode. The pixel path never consults NSScreen, so this works regardless of the host display or whether a user is logged in on the host. The hint lives in VMConfig (VMDisplayConfig.ppi) and defaults to the existing 72 when omitted, so behavior is unchanged for current VMs and configs. Covered by VMConfigTests (parsing, description round-trip, effective-PPI default, backward compatibility, malformed input). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>		2026-07-28 13:43:10 +02:00
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TartTests	Add optional @PPI hint to --display for HiDPI pixel displays	2026-07-28 13:43:10 +02:00