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Fixes #3075

When a multi-monitor session has the top-left vertex of the primary monitor at a desktop location other than (0,0), minimising and maximising the session results in the (0,0) co-ordinate of the entire desktop being placed at the top-left of the primary monitor.

The implementation seems to be at odds with [MS-RDPEGFX] 2.2.2.14 which suggests the monitorDefArray of the RDPGFX_RESET_GRAPHICS_PDU should be the same as that in the Monitor Layout PDU ([MS-RDPBCGR] 2.2.12.1)

when a multi-monitor session has the top-left vertex of the primary
monitor at a desktop location other than (0,0), minimising and maximising
the session results in the (0,0) co-ordinate of the entire desktop being
placed at the top-left of the primary monitor.

The implementation seems to be at odds with [MS-RDPEGFX] 2.2.2.14 which
suggests the monitorDefArray of the RDPGFX_RESET_GRAPHICS_PDU should be
the same as that in the Monitor Layout PDU ([MS-RDPBCGR] 2.2.12.1)
@matt335672
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This is a tiny change, but I suspect it will need a lot of testing, particularly as we've got at least one enterprise user who has deployed GFX.

I've tested this with two screens and monitor hot-plug/unplug on Windows 10 so far. The primary screen was to the right of the secondary.

@metalefty
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LGTM so far.

@matt335672
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I've done as much testing as I can with my equipment.

I think I'll merge this into devel and set up a cherry-pick for v0.10. If we get no more reported problems with devel we can update v0.10 too.

@matt335672 matt335672 merged commit 1d927ad into neutrinolabs:devel Jun 19, 2024
@matt335672 matt335672 deleted the investigate_gfx_min_max_issue branch June 19, 2024 08:13
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xrdp v0.10 incorrect behavior when minimizing and restoring a mstsc.exe connection in fullscreen with multiple monitors (v0.9 works fine)
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