fix(emacs/lean-type): change where to trigger eldoc

Previously, eldoc is triggered regardless of current position.
Now, it is triggered:

 - *NOT* looking-at whitespace or
 - looking-back end-parens such as ')', '}', ']', etc

src/emacs/lean-server.el

@@ -493,7 +493,8 @@ If it's not the same with file-name (default: buffer-file-name), send VISIT cmd.
 (defun lean-server-get-info-record-at-pos (body)
   (let* ((file-name (buffer-file-name))
          (column (current-column)))
-    (when (and (looking-at (rx (or white "," ")" "}" "]")))
+    (when (and (or (looking-at (rx (or white "," ")" "}" "]")))
+                   (eolp))
                (> column 1))
       (setq column (1- column)))
     (lean-info-record-parse body file-name column)))

src/emacs/lean-type.el

@@ -42,7 +42,11 @@
 (defun lean-eldoc-documentation-function ()
   "Show information of lean expression at point if any"
   (interactive)
-  (lean-get-info-record-at-point 'lean-eldoc-documentation-function-cont))
+  (when (or (and (not (looking-at (rx white)))
+                 (not (eolp)))
+            (and (looking-back (rx (not white)))
+                 (not (bolp))))
+    (lean-get-info-record-at-point 'lean-eldoc-documentation-function-cont)))
 
 ;; =======================================================
 ;; eval