Platform IME: Windows: Revert 133bbafa and 29a8ee08 as regression until new results comes. (#2589, #5535, #5264, #4972)

docs/CHANGELOG.txt

@@ -74,7 +74,7 @@ Other Changes:
   can apply to mouse data as well. (#4921)
 - Nav: Fixed moving/resizing window with gamepad or keyboard when running at very high framerate.
 - Nav: Pressing Space/GamepadFaceDown on a repeating button uses the same repeating rate as a mouse hold.
-- Platform IME: [Windows] Fixed a call to ImmAssociateContextEx() leading to freeze on some setups.
+- Platform IME: [Windows] Removed call to ImmAssociateContextEx() leading to freeze on some setups.
   (#2589, #5535, #5264, #4972)
 - Misc: io.Framerate moving average now converge in 60 frames instead of 120. (#5236, #4138)
 - Debug Tools: Debug Log: Added IO events logging.

imgui.cpp

@@ -12231,9 +12231,9 @@ static void SetPlatformImeDataFn_DefaultImpl(ImGuiViewport* viewport, ImGuiPlatf
     if (hwnd == 0)
         return;
 
+    //::ImmAssociateContextEx(hwnd, NULL, data->WantVisible ? IACE_DEFAULT : 0);
     if (HIMC himc = ::ImmGetContext(hwnd))
     {
-        ::ImmAssociateContextEx(hwnd, NULL, data->WantVisible ? IACE_DEFAULT : 0);
         COMPOSITIONFORM composition_form = {};
         composition_form.ptCurrentPos.x = (LONG)data->InputPos.x;
         composition_form.ptCurrentPos.y = (LONG)data->InputPos.y;