[PATCH v3 1/1] win32u: Don't report cloned monitors in EnumDisplayMonitors().

[Arkadiusz Hiler]

From: Arkadiusz Hiler <ahiler at codeweavers.com>

Based on:
ca39b1c22dfa ("user32: Don't report mirrored slave monitors in EnumDisplayMonitors.")
2affb854e524 ("user32: Change slave to a more neutral word.")

Which seem to got lost during:
318673405c62 ("win32u: Move NtUserEnumDisplayMonitors implementation from user32.")

Fixes regression with Elite Dangerous launcher freezing when cloned
displays are present.

Signed-off-by: Arkadiusz Hiler <ahiler at codeweavers.com>
---
 dlls/win32u/sysparams.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index a8c1d977c7d..884c9588b51 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -223,6 +223,7 @@ struct monitor
     unsigned int flags;
     RECT rc_monitor;
     RECT rc_work;
+    BOOL is_clone;
 };
 
 static struct list adapters = LIST_INIT(adapters);
@@ -1249,7 +1250,7 @@ static BOOL update_display_cache_from_registry(void)
     DWORD adapter_id, monitor_id, monitor_count = 0, size;
     KEY_BASIC_INFORMATION key;
     struct adapter *adapter;
-    struct monitor *monitor;
+    struct monitor *monitor, *monitor2;
     HANDLE mutex = NULL;
     NTSTATUS status;
     BOOL ret;
@@ -1295,6 +1296,15 @@ static BOOL update_display_cache_from_registry(void)
                 break;
             }
 
+            LIST_FOR_EACH_ENTRY(monitor2, &monitors, struct monitor, entry)
+            {
+                if (EqualRect(&monitor2->rc_monitor, &monitor->rc_monitor))
+                {
+                    monitor->is_clone = TRUE;
+                    break;
+                }
+            }
+
             monitor->handle = UlongToHandle( ++monitor_count );
             list_add_tail( &monitors, &monitor->entry );
         }
@@ -2016,6 +2026,7 @@ BOOL WINAPI NtUserEnumDisplayMonitors( HDC hdc, RECT *rect, MONITORENUMPROC proc
                                 get_thread_dpi() );
         OffsetRect( &monrect, -origin.x, -origin.y );
         if (!intersect_rect( &monrect, &monrect, &limit )) continue;
+        if (monitor->is_clone) continue;
 
         enum_info[count].handle = monitor->handle;
         enum_info[count].rect = monrect;
-- 
GitLab

https://gitlab.winehq.org/wine/wine/-/merge_requests/303