feat(chinese): add +childframe for pyim candidates

Close: #6482
Co-authored-by: merrickluo <merrickluo@users.noreply.github.com>

modules/input/chinese/README.org

@@ -13,6 +13,8 @@ methods: Pinyin and Wubi.
 ** Module flags
 - +rime ::
   Enables the [[https://rime.im/][rime]] backend for pyim.
+- +childframe ::
+  Display pyim candidates in a [[https://www.gnu.org/software/emacs/manual/html_node/elisp/Child-Frames.html][child frame]] rather than overlay or tooltip.
 
 ** Packages
 - [[doom-package:ace-pinyin]]
@@ -21,6 +23,7 @@ methods: Pinyin and Wubi.
 - [[doom-package:fcitx]]
 - [[doom-package:liberime]] if [[doom-module:+rime]]
 - [[doom-package:pangu-spacing]]
+- [[doom-package:posframe]] if [[doom-module:+childframe]]
 - [[doom-package:pyim]] unless [[doom-module:+wubi]]
 
 ** Hacks

modules/input/chinese/config.el

@@ -13,6 +13,9 @@
       current-input-method)
     (add-to-list 'evil-escape-inhibit-functions #'+chinese--input-method-p))
 
+  (when (modulep! +childframe)
+    (setq pyim-page-tooltip 'posframe))
+
   ;; allow vertico/selectrum search with pinyin
   (cond ((modulep! :completion vertico)
          (advice-add #'orderless-regexp

modules/input/chinese/packages.el

@@ -7,5 +7,7 @@
 (package! pangu-spacing :pin "2303013e5cd7852136f1429162fea0e1c8cb0221")
 (when (modulep! +rime)
   (package! liberime :pin "8291e22cd0990a99cb2f88ca67a9065a157f39af"))
+(when (modulep! +childframe)
+  (package! posframe :pin "0d23bc5f7cfac00277d83ae7ba52c48685bcbc68"))
 (when (modulep! :editor evil +everywhere)
   (package! evil-pinyin :pin "3e9e501ded86f88e01a4edec5d526ab0fab879d7"))