fix(doc): Hovering tooltip (#772)

lsp-ui-doc.el

@@ -662,7 +662,7 @@ FN is the function to call on click."
       (when (< fill-column (length first-line))
         (fill-region start (point-max))))))
 
-(defun lsp-ui-doc--make-smaller-empty-lines nil
+(defun lsp-ui-doc--make-smaller-empty-lines ()
   "Make empty lines half normal lines."
   (progn  ; Customize line before header
     (goto-char 1)
@@ -682,7 +682,7 @@ FN is the function to call on click."
     (forward-line))
   (insert (propertize "\n\n" 'face '(:height 0.3))))
 
-(defun lsp-ui-doc--fix-hr-props nil
+(defun lsp-ui-doc--fix-hr-props ()
   ;; We insert the right display prop after window-text-pixel-size
   (lsp-ui-doc--with-buffer
     (let (next)
@@ -767,7 +767,7 @@ FN is the function to call on click."
 
 (defvar-local lsp-ui-doc--inline-width nil)
 
-(defun lsp-ui-doc--inline-window-width nil
+(defun lsp-ui-doc--inline-window-width ()
   (- (min (window-text-width) (window-body-width))
      (if (bound-and-true-p display-line-numbers-mode)
          (+ 2 (line-number-display-width))
@@ -854,7 +854,7 @@ HEIGHT is the documentation number of lines."
       (not (display-graphic-p))
       (not (fboundp 'display-buffer-in-child-frame))))
 
-(defun lsp-ui-doc--highlight-hover nil
+(defun lsp-ui-doc--highlight-hover ()
   (when lsp-ui-doc--from-mouse-current
     (-let* (((start . end) lsp-ui-doc--bounds)
             (ov (if (overlayp lsp-ui-doc--highlight-ov) lsp-ui-doc--highlight-ov
@@ -930,9 +930,10 @@ HEIGHT is the documentation number of lines."
     keyboard-quit
     ignore
     handle-switch-frame
-    mwheel-scroll))
+    mwheel-scroll)
+  "List of command to ignore requests.")
 
-(defun lsp-ui-doc--make-request nil
+(defun lsp-ui-doc--make-request ()
   "Request the documentation to the LS."
   (and (not track-mouse) lsp-ui-doc-show-with-mouse (setq-local track-mouse t))
   (when (and lsp-ui-doc-show-with-cursor
@@ -1094,9 +1095,18 @@ Argument WIN is current applying window."
            :mode 'tick
            :cancel-token :lsp-ui-doc-hover))))))
 
+(defun lsp-ui-doc--tooltip-mouse-motion (event)
+  "Default tooltip (EVENT) action."
+  (interactive "e")
+  (tooltip-hide)
+  (when (car (mouse-pixel-position))
+    (tooltip-start-delayed-tip)
+    (setq tooltip-last-mouse-motion-event event)))
+
 (defun lsp-ui-doc--handle-mouse-movement (event)
   "Show the documentation corresponding to the text under EVENT."
   (interactive "e")
+  (lsp-ui-doc--tooltip-mouse-motion event)
   (when lsp-ui-doc-show-with-mouse
     (lsp-ui-util-safe-kill-timer lsp-ui-doc--timer-mouse-movement)
     (let* ((e (cadr event))
@@ -1128,22 +1138,32 @@ Argument WIN is current applying window."
   "Nil if `track-mouse' was set by another package.
 If nil, do not prevent mouse on prefix keys.")
 
-(defun lsp-ui-doc--setup-mouse nil
-  (when lsp-ui-doc-show-with-mouse
+(defvar lsp-ui-doc-mode-map
+  (let ((map (make-sparse-keymap)))
+    map)
+  "Keymap for `lsp-ui-doc-mode'.")
+
+(defun lsp-ui-doc--setup-mouse ()
+  "Setup mouse."
+  (cond
+   (lsp-ui-doc-show-with-mouse
+    (define-key lsp-ui-doc-mode-map (kbd "<mouse-movement>") #'lsp-ui-doc--handle-mouse-movement)
     (setq lsp-ui-doc--mouse-tracked-by-us (not track-mouse))
     (setq-local track-mouse t)
     (unless lsp-ui-doc--timer-mouse-idle
       ;; Set only 1 timer for all buffers
       (setq lsp-ui-doc--timer-mouse-idle
-            (run-with-idle-timer 0 t 'lsp-ui-doc--disable-mouse-on-prefix)))))
+            (run-with-idle-timer 0 t 'lsp-ui-doc--disable-mouse-on-prefix))))
+   (t
+    (define-key lsp-ui-doc-mode-map (kbd "<mouse-movement>") nil))))
 
 (defun lsp-ui-doc--prevent-focus-doc (e)
   (not (frame-parameter (cadr e) 'lsp-ui-doc--no-focus)))
 
 (define-minor-mode lsp-ui-doc-mode
   "Minor mode for showing hover information in child frame."
   :init-value nil
-  :keymap `((,(kbd "<mouse-movement>") . lsp-ui-doc--handle-mouse-movement))
+  :keymap lsp-ui-doc-mode-map
   :group lsp-ui-doc
   (cond
    (lsp-ui-doc-mode