bug#36165: 27.0.50; `select-frame-set-input-focus' moves mouse pointer outside of frame

bug#36165: 27.0.50; `select-frame-set-input-focus' moves mouse pointer outside of frame

[Pip Cet]

[-- Attachment #1: Type: text/plain, Size: 1426 bytes --]

In emacs -Q, disable scroll-bar-mode and evaluate:

(let ((mouse-autoselect-window t))
  (select-frame-set-input-focus (window-frame)))

The mouse pointer will now be to the right of the window frame; with
normal window managers, this doesn't matter much, except that a "resize
this window" cursor might be shown rather than the usual one, but with
tiling window managers, the cursor position may correspond to another
window, which is then raised and wrongly receives keyboard focus. This
actually happened to me.

The attached patch fixes things, by moving the mouse pointer to the last
valid x position.

diff --git a/lisp/frame.el b/lisp/frame.el
index a8c230cb7b..7b61003c9a 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -979,10 +979,11 @@ select-frame-set-input-focus
   ;; Move mouse cursor if necessary.
   (cond
    (mouse-autoselect-window
-    (let ((edges (window-inside-edges (frame-selected-window frame))))
+    (let ((edges (window-edges (frame-selected-window frame)
+                               t nil t)))
       ;; Move mouse cursor into FRAME's selected window to avoid that
       ;; Emacs mouse-autoselects another window.
-      (set-mouse-position frame (nth 2 edges) (nth 1 edges))))
+      (set-mouse-pixel-position frame (1- (nth 2 edges)) (nth 1 edges))))
    (focus-follows-mouse
     ;; Move mouse cursor into FRAME to avoid that another frame gets
     ;; selected by the window manager.

[-- Attachment #2: emacs-patch-2.diff --]
[-- Type: text/x-patch, Size: 818 bytes --]

diff --git a/lisp/frame.el b/lisp/frame.el
index a8c230cb7b..7b61003c9a 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -979,10 +979,11 @@ select-frame-set-input-focus
   ;; Move mouse cursor if necessary.
   (cond
    (mouse-autoselect-window
-    (let ((edges (window-inside-edges (frame-selected-window frame))))
+    (let ((edges (window-edges (frame-selected-window frame)
+                               t nil t)))
       ;; Move mouse cursor into FRAME's selected window to avoid that
       ;; Emacs mouse-autoselects another window.
-      (set-mouse-position frame (nth 2 edges) (nth 1 edges))))
+      (set-mouse-pixel-position frame (1- (nth 2 edges)) (nth 1 edges))))
    (focus-follows-mouse
     ;; Move mouse cursor into FRAME to avoid that another frame gets
     ;; selected by the window manager.

bug#36165: 27.0.50; `select-frame-set-input-focus' moves mouse pointer outside of frame

[martin rudalics]

 > In emacs -Q, disable scroll-bar-mode and evaluate:
 >
 > (let ((mouse-autoselect-window t))
 >    (select-frame-set-input-focus (window-frame)))
 >
 > The mouse pointer will now be to the right of the window frame; with
 > normal window managers, this doesn't matter much, except that a "resize
 > this window" cursor might be shown rather than the usual one, but with
 > tiling window managers, the cursor position may correspond to another
 > window, which is then raised and wrongly receives keyboard focus. This
 > actually happened to me.
 >
 > The attached patch fixes things, by moving the mouse pointer to the last
 > valid x position.

Pushed to master.  Please have a look and close the bug in case I did
things right.

Thank your very much, martin

bug#36165: 27.0.50; `select-frame-set-input-focus' moves mouse pointer outside of frame

[Pip Cet]

Thanks, it appears to work here.

On Tue, Jun 11, 2019 at 8:17 AM martin rudalics <rudalics@gmx.at> wrote:
>
>  > In emacs -Q, disable scroll-bar-mode and evaluate:
>  >
>  > (let ((mouse-autoselect-window t))
>  >    (select-frame-set-input-focus (window-frame)))
>  >
>  > The mouse pointer will now be to the right of the window frame; with
>  > normal window managers, this doesn't matter much, except that a "resize
>  > this window" cursor might be shown rather than the usual one, but with
>  > tiling window managers, the cursor position may correspond to another
>  > window, which is then raised and wrongly receives keyboard focus. This
>  > actually happened to me.
>  >
>  > The attached patch fixes things, by moving the mouse pointer to the last
>  > valid x position.
>
> Pushed to master.  Please have a look and close the bug in case I did
> things right.
>
> Thank your very much, martin