Make sure we don’t set point just because there is a click in an inactive window

lisp/gp-mouse.el

@@ -0,0 +1,27 @@
+;;; gp-mouse --- Extra mouse functionality
+
+;;; Commentary:
+
+;;; Code:
+(require 'mouse)
+
+(defun gpolonkai/event-in-current-window-p (event)
+  "Check if EVENT happened in the current window."
+  (let ((current-window (selected-window))
+        (event-window (posn-window (event-start event))))
+    (eq current-window event-window)))
+
+(defun gpolonkai/mouse-set-point (click &optional promote-to-region)
+  "Set mouse position.
+
+If CLICK happened in an inactive window, select that window without setting point"
+  (interactive "e\np")
+  (if (gpolonkai/event-in-current-window-p click)
+      (call-interactively 'mouse-set-point)
+    (call-interactively 'mouse-select-window)))
+
+(global-set-key [mouse-1] 'mouse-select-window-or-set-point)
+(global-unset-key [down-mouse-1])
+
+(provide 'gp-mouse)
+;;; gp-mouse.el ends here