[KRdp] [Bug 523974] Krdp mouse input issues in multi monitor setup / virtual monitor on existing plasma session

https://bugs.kde.org/show_bug.cgi?id=523974

André Altmüller <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #1 from André Altmüller <[email protected]> ---
Confirming this on Plasma 6.7.4 (krdp 6.7.4, KWin 6.7.4, Arch/CachyOS) with a
headless host (zero physical outputs, krdpserver --virtual-monitor 2560x1440@1
--plasma). Same symptoms: remote cursor stuck at top-left edge, clicks land in
empty space, every mouse move re-triggers Overview because the cursor sits
exactly on the hot corner.

ROOT CAUSE
The virtual-monitor screencast stream never records its size. In
src/screencasting.cpp:
- createOutputStream() sets stream->d->m_size = screen->virtualSize();
- createRegionStream() sets stream->d->m_size = g.size();
- createVirtualMonitorStream() sets NOTHING — m_size stays 0x0.

PlasmaScreencastV1Session::start() then does
setLogicalSize(d->request->size()), i.e. 0x0, and the mouse-move handler
computes logicalPosition = (x / 2560) * 0 = 0, so krdp forwards
pointer_motion_absolute(0, 0) on every move. Verified with WAYLAND_DEBUG=1:
button events forward fine, motion arrives clamped to the corner. Keyboard
unaffected.

FIX (one line, confirmed working)
In createVirtualMonitorStream(): add
    stream->d->m_size = resolution;
after the stream_virtual_output() call. Built 6.7.4 with this patch: pointer
tracks 1:1, clicks and drags work. Still present in current master.

Note: the wl_fixed scaling fix (804eb47) is a different issue and is already in
6.7.4; it does not fix this bug.

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