[PATCH v4 09/14] Revert "win32u: Remove now unnecessary reset_display_manager_ctx."

[Paul Gofman]

From: Paul Gofman

This reverts commit 79f3573d8feb638c383c4dff4573ccf711d571af.
---
 dlls/win32u/sysparams.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index 9ebd6e26fc4..3211d4e7d8b 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -1485,14 +1485,9 @@ static const struct gdi_device_manager device_manager =
     add_modes,
 };

-static void release_display_manager_ctx( struct device_manager_ctx *ctx )
+static void reset_display_manager_ctx( struct device_manager_ctx *ctx )
 {
-    if (ctx->mutex)
-    {
-        pthread_mutex_unlock( &display_lock );
-        release_display_device_init_mutex( ctx->mutex );
-        ctx->mutex = 0;
-    }
+    HANDLE mutex = ctx->mutex;

if (ctx->source_key)
     {
@@ -1500,6 +1495,20 @@ static void release_display_manager_ctx( struct device_manager_ctx *ctx )
         last_query_display_time = 0;
     }
     if (ctx->gpu_count) cleanup_devices();
+
+    memset( ctx, 0, sizeof(*ctx) );
+    if ((ctx->mutex = mutex)) prepare_devices();
+}
+
+static void release_display_manager_ctx( struct device_manager_ctx *ctx )
+{
+    if (ctx->mutex)
+    {
+        pthread_mutex_unlock( &display_lock );
+        release_display_device_init_mutex( ctx->mutex );
+        ctx->mutex = 0;
+    }
+    reset_display_manager_ctx( ctx );
 }

static void clear_display_devices(void)