[PATCH v5 1/1] imm32: Do not overwrite input context window with GetFocus() in ime_ui_update_window.

[chenzhengyong]

From: chenzhengyong

Overwriting ctx->hWnd with the current focus window breaks the
relationship between the HIMC handle and its associated window.
This direct assignment does not update the corresponding state
in the wine server, leading to inconsistencies between client and
server.

Signed-off-by: chenzhengyong 
---
 dlls/imm32/ime.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dlls/imm32/ime.c b/dlls/imm32/ime.c
index 1487c847e00..3f51cea3dbf 100644
--- a/dlls/imm32/ime.c
+++ b/dlls/imm32/ime.c
@@ -318,6 +318,8 @@ static void ime_ui_update_window( INPUTCONTEXT *ctx, HWND hwnd )
 {
     WCHAR *str;
     UINT len;
+    DWORD ui_thread;
+    DWORD current_thread;

if (!(str = input_context_get_comp_str( ctx, FALSE, &len )) || !*str)
         ShowWindow( hwnd, SW_HIDE );
@@ -328,7 +330,12 @@ static void ime_ui_update_window( INPUTCONTEXT *ctx, HWND hwnd )
     }
     free( str );

-    ctx->hWnd = GetFocus();
+    /* Only update ctx->hWnd when called from the same UI thread. */
+    ui_thread = GetWindowThreadProcessId(ctx->hWnd, NULL);
+    current_thread = GetCurrentThreadId();
+
+    if (ui_thread == current_thread)
+        ctx->hWnd = GetFocus();
 }

static void ime_ui_composition( HIMC himc, HWND hwnd, LPARAM lparam )