Platform IME: Windows: Fixed a call to ImmAssociateContextEx() leading to freeze on some setups. (#2589, #5535, #5264, #4972)

+ misc comments

docs/CHANGELOG.txt

@@ -74,6 +74,8 @@ 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.
+  (#2589, #5535, #5264, #4972)
 - Misc: io.Framerate moving average now converge in 60 frames instead of 120. (#5236, #4138)
 - Tools: Item Picker: Mouse button can be changed by holding Ctrl+Shift, making it easier
   to use the Item Picker in e.g. menus. (#2673)

docs/CONTRIBUTING.md

@@ -10,6 +10,7 @@
 
 ## Getting Started & General Advices
 
+- Article: [How To Ask Good Questions](https://bit.ly/3nwRnx1).
 - Please browse the [Wiki](https://github.com/ocornut/imgui/wiki) to find code snippets, links and other resources (e.g. [Useful extensions](https://github.com/ocornut/imgui/wiki/Useful-Extensions)).
 - Please read [docs/FAQ.md](https://github.com/ocornut/imgui/blob/master/docs/FAQ.md).
 - Please read [docs/FONTS.md](https://github.com/ocornut/imgui/blob/master/docs/FONTS.md) if your question relates to fonts or text.
@@ -19,6 +20,7 @@
 - Please use the search function of GitHub to look for similar issues. You may [browse issues by Labels](https://github.com/ocornut/imgui/labels).
 - Please use a web search engine to look for similar issues.
 - If you get a crash or assert, use a debugger to locate the line triggering it and read the comments around.
+- Please don't be a [Help Vampire](https://slash7.com/2006/12/22/vampires/).
 
 ## Issues vs Discussions
 
@@ -41,6 +43,7 @@ Please do your best to clarify your request.  The amount of incomplete or ambigu
 
 Steps:
 
+- Article: [How To Ask Good Questions](https://bit.ly/3nwRnx1).
 - **PLEASE DO FILL THE REQUESTED NEW ISSUE TEMPLATE.** Including dear imgui version number, branch name, platform/renderer back-ends (imgui_impl_XXX files), operating system.
 - **Try to be explicit with your Goals, your Expectations and what you have Tried**.  Be mindful of [The XY Problem](http://xyproblem.info/). What you have in mind or in your code is not obvious to other people. People frequently discuss problems and suggest incorrect solutions without first clarifying their goal. When requesting a new feature, please describe the usage context (how you intend to use it, why you need it, etc..). If you tried something and it failed, show us what you tried.
 - **Attach screenshots (or gif/video) to clarify the context**. They often convey useful information that are omitted by the description. You can drag pictures/files in the message edit box. Avoid using 3rd party image hosting services, prefer the long term longevity of GitHub attachments (you can drag pictures into your post). On Windows you can use [ScreenToGif](https://www.screentogif.com/) to easily capture .gif files.

docs/EXAMPLES.md

@@ -178,7 +178,7 @@ This may actually also work with OpenGL 2.x contexts! <BR>
 [example_sdl_sdlrenderer/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_sdlrenderer/) <BR>
 SDL2 (Win32, Mac, Linux, etc.) + SDL_Renderer (most graphics backends are supported underneath) <BR>
 = main.cpp + imgui_impl_sdl.cpp + imgui_impl_sdlrenderer.cpp <BR>
-This requires SDL 2.0.17+ (expected to release November 2021) <BR>
+This requires SDL 2.0.18+ (released November 2021) <BR>
 We do not really recommend using SDL_Renderer as it is a rather primitive API.
 
 [example_sdl_vulkan/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_vulkan/) <BR>

imgui.cpp

@@ -8535,6 +8535,9 @@ ImVec2 ImGui::GetCursorScreenPos()
     return window->DC.CursorPos;
 }
 
+// 2022/08/05: Setting cursor position also extend boundaries (via modifying CursorMaxPos) used to compute window size, group size etc.
+// I believe this was is a judicious choice but it's probably being relied upon (it has been the case since 1.31 and 1.50)
+// It would be sane if we requested user to use SetCursorPos() + Dummy(ImVec2(0,0)) to extend CursorMaxPos...
 void ImGui::SetCursorScreenPos(const ImVec2& pos)
 {
     ImGuiWindow* window = GetCurrentWindow();
@@ -12219,10 +12222,9 @@ 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;