feat(sei.c): cursorwarp patch

README.md

@@ -70,3 +70,5 @@ makepkg -si
 - [nametag](https://dwm.suckless.org/patches/nametag/): Name tags using <kbd>mod+n</kbd>
 - [centretitle](https://dwm.suckless.org/patches/centretitle/): Optionally
   centre the focused client's title
+- [cursor](https://dwm.suckless.org/patches/cursorwarp/): Warps the mouse cursor
+  to the center of the target window when changing focus

config.h

@@ -12,7 +12,7 @@ static const char *wmname = "sei";
 static unsigned int borderpx = 2; /* border pixel of windows */
 static unsigned int snap = 32;    /* snap pixel */
 static const unsigned int systraypinning =
-    0; /* 0: sloppy systray follows selected monitor, >0: pin systray to monitor
+    1; /* 0: sloppy systray follows selected monitor, >0: pin systray to monitor
           X */
 static const unsigned int systrayonleft =
     1; /* 0: systray in the right corner, >0: systray on left of status text */

sei.c

@@ -1282,6 +1282,9 @@ void focusmon(const Arg *arg) {
   unfocus(selmon->sel, 0);
   selmon = m;
   focus(NULL);
+  if (selmon->sel)
+    XWarpPointer(dpy, None, selmon->sel->win, 0, 0, 0, 0, selmon->sel->w / 2,
+                 selmon->sel->h / 2);
 }
 
 void focusstack(const Arg *arg) {
@@ -1296,6 +1299,7 @@ void focusstack(const Arg *arg) {
     ;
   focus(c ? c : p);
   restack(selmon);
+  XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w / 2, c->h / 2);
 }
 
 Atom getatomprop(Client *c, Atom prop) {
@@ -1657,6 +1661,8 @@ void manage(Window w, XWindowAttributes *wa) {
     swallow(term, c);
   arrange(c->mon);
   focus(NULL);
+  if (c && c->mon == selmon)
+    XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w / 2, c->h / 2);
 }
 
 void mappingnotify(XEvent *e) {
@@ -2581,6 +2587,9 @@ void unmanage(Client *c, int destroyed) {
     s->swallowing = NULL;
     arrange(m);
     focus(NULL);
+    if (m == selmon && m->sel)
+      XWarpPointer(dpy, None, m->sel->win, 0, 0, 0, 0, m->sel->w / 2,
+                   m->sel->h / 2);
     return;
   }
 
@@ -2605,6 +2614,9 @@ void unmanage(Client *c, int destroyed) {
     arrange(m);
     focus(NULL);
     updateclientlist();
+    if (m == selmon && m->sel)
+      XWarpPointer(dpy, None, m->sel->win, 0, 0, 0, 0, m->sel->w / 2,
+                   m->sel->h / 2);
   }
 }