Harden DWM plugins against X11 stacking/keyboard grab races and speed up QMI status

src/dwm-plugins/sms_plugin.cpp

@@ -862,6 +862,7 @@ int runSmsApp(int argc, char** argv) {
   };
 
   auto showWindow = [&](const std::string& argStr) {
+    writeIntFile(activePidPath, static_cast<int>(::getpid()));
     closeOtherPlugins("sms");
     reloadAllData(true);
     lastTapDigit = -1;
@@ -881,21 +882,13 @@ int runSmsApp(int argc, char** argv) {
       selectedThread = 0;
     }
 
-    writeIntFile(activePidPath, static_cast<int>(::getpid()));
     if (!visible) {
       visible = true;
       XMapRaised(dpy, win);
-      for (int i = 0; i < 20; ++i) {
-        if (XGrabKeyboard(dpy, win, True, GrabModeAsync, GrabModeAsync,
-                          CurrentTime) == GrabSuccess) {
-          break;
-        }
-        usleep(2000);
-      }
     } else {
       XRaiseWindow(dpy, win);
     }
-    XSetInputFocus(dpy, win, RevertToPointerRoot, CurrentTime);
+    grabPluginKeyboard(dpy, win);
     openStartMs = nowMs();
     startupIgnoreUntilMs = openStartMs + 180;
     initialSoftkeysReleased = (querySoftkeysDown(dpy) == 0);
@@ -1117,6 +1110,15 @@ int runSmsApp(int argc, char** argv) {
 
       if (ev.type == Expose && ev.xexpose.count == 0) {
         drawUI();
+      } else if (ev.type == VisibilityNotify &&
+                 ev.xvisibility.state != VisibilityUnobscured) {
+        if (isAnotherPluginActive("sms")) {
+          hideWindow();
+        } else {
+          XRaiseWindow(dpy, win);
+          grabPluginKeyboard(dpy, win);
+          drawUI();
+        }
       } else if (ev.type == KeyRelease) {
         unsigned int kc = ev.xkey.keycode;
         KeySym sym = XLookupKeysym(&ev.xkey, 0);