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ksmithandClaude Sonnet 5
e49fa0cf26
Implements RFC 6143 SS7.7.4: rectangles announced as Hextile (type 5) tile the update into 16x16 blocks, each either raw pixels or a background fill plus an optional list of foreground/individually- colored subrects, with background/foreground persisting across tiles within one rectangle when not re-specified. The pure byte-decode logic (tile metadata, subrect list) lives in new src/vnc_pixel_codecs.h/.cpp, kept separate from VncSessionBackend's wire-sequencing state machine so it's unit-testable without a socket -- the pattern the plan calls for continuing into the ZRLE/Tight work still ahead. Adds 5 fake-server tests covering a raw tile, a background-only solid fill, uncoloured and individually-colored subrects, and a 4-tile rectangle proving background persistence and correct tile-cursor wraparound. Verified against the live TightVNC test server (connect, frame, cursor, clipboard all still work); that particular server always chose Raw for the actual framebuffer content during this session, so Hextile's real-world path isn't independently confirmed live -- the unit tests are the primary correctness evidence for this phase. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>