Explicitly set the windows for testcase and result buffers #70 (#109)

* Explicitly set the windows for testcase and result buffers #70

* Create the new buffer with the name right away then renaming later.

* Reverting the changes done in previous commit.

*html* buffer is created by the shr library and is only renamed by leetcode.
An alternative could be to create a clone of the buffer with expected name and
delete the *html* buffer.

Author: swapnilsm

leetcode.el

@@ -175,6 +175,15 @@ The object with following attributes:
   "LeetCode programming language or sql for current problem internally.
 Default is programming language.")
 
+(defvar leetcode--description-window nil
+  "(Internal) Holds the reference to description window.")
+
+(defvar leetcode--testcase-window nil
+  "(Internal) Holds the reference to testcase window.")
+
+(defvar leetcode--result-window nil
+  "(Internal) Holds the reference to result window.")
+
 (defconst leetcode--lang-suffixes
   '(("c" . ".c") ("cpp" . ".cpp") ("csharp" . ".cs")
     ("golang" . ".go") ("java" . ".java") ("javascript" . ".js")
@@ -879,11 +888,11 @@ LeetCode require slug-title as the request parameters."
 |               |    Result      |
 +---------------+----------------+"
   (delete-other-windows)
-  (split-window-horizontally)
+  (setq leetcode--description-window (split-window-horizontally))
   (other-window 1)
-  (split-window-below)
+  (setq leetcode--testcase-window (split-window-below))
   (other-window 1)
-  (split-window-below)
+  (setq leetcode--result-window (split-window-below))
   (other-window -1)
   (other-window -1))
 
@@ -1274,16 +1283,10 @@ major mode by `leetcode-prefer-language'and `auto-mode-alist'."
       (with-current-buffer (get-buffer-create testcase-buf-name)
         (erase-buffer)
         (insert testcase)
-        (display-buffer (current-buffer)
-                        '((display-buffer-reuse-window
-                           leetcode--display-testcase)
-                          (reusable-frames . visible))))
+        (set-window-buffer leetcode--testcase-window (current-buffer)))
       (with-current-buffer (get-buffer-create result-buf-name)
         (erase-buffer)
-        (display-buffer (current-buffer)
-                        '((display-buffer-reuse-window
-                           leetcode--display-result)
-                          (reusable-frames . visible)))))))
+        (set-window-buffer leetcode--result-window (current-buffer))))))
 
 (aio-defun leetcode-restore-layout ()
   "This command should be run in LeetCode code buffer.