Remove global event listener when appropriate.

Otherwise trimChats called in `fullscreen` tests (due to being
registered in a previous test)

dist/converse.js

@@ -53176,15 +53176,17 @@ _converse_headless_converse_core__WEBPACK_IMPORTED_MODULE_1__["default"].plugins
       _converse.emit('minimizedChatsInitialized');
     }).catch(_.partial(_converse.log, _, Strophe.LogLevel.FATAL));
 
-    _converse.on('registeredGlobalEventHandlers', function () {
-      window.addEventListener("resize", _.debounce(function (ev) {
+    const debouncedTrim = _.debounce(ev => {
       if (_converse.connection.connected) {
         _converse.chatboxviews.trimChats();
       }
-      }, 200));
-    });
+    }, 200);
+
+    _converse.api.listen.on('registeredGlobalEventHandlers', () => window.addEventListener("resize", debouncedTrim));
 
-    _converse.on('controlBoxOpened', function (chatbox) {
+    _converse.api.listen.on('unregisteredGlobalEventHandlers', () => window.removeEventListener("resize", debouncedTrim));
+
+    _converse.api.listen.on('controlBoxOpened', function (chatbox) {
       // Wrapped in anon method because at scan time, chatboxviews
       // attr not set yet.
       if (_converse.connection.connected) {
@@ -62951,7 +62953,7 @@ function finishInitialization() {
 function unregisterGlobalEventHandlers() {
   document.removeEventListener("visibilitychange", _converse.saveWindowState);
 
-  _converse.emit('registeredGlobalEventHandlers');
+  _converse.emit('unregisteredGlobalEventHandlers');
 }
 
 function cleanup() {

src/converse-minimize.js

@@ -517,15 +517,15 @@ converse.plugins.add('converse-minimize', {
         }).catch(_.partial(_converse.log, _, Strophe.LogLevel.FATAL));
 
 
-        _converse.on('registeredGlobalEventHandlers', function () {
-            window.addEventListener("resize", _.debounce(function (ev) {
+        const debouncedTrim = _.debounce(ev => {
             if (_converse.connection.connected) {
                 _converse.chatboxviews.trimChats();
             }
-            }, 200));
-        });
+        }, 200);
+        _converse.api.listen.on('registeredGlobalEventHandlers', () => window.addEventListener("resize", debouncedTrim));
+        _converse.api.listen.on('unregisteredGlobalEventHandlers', () => window.removeEventListener("resize", debouncedTrim));
 
-        _converse.on('controlBoxOpened', function (chatbox) {
+        _converse.api.listen.on('controlBoxOpened', function (chatbox) {
             // Wrapped in anon method because at scan time, chatboxviews
             // attr not set yet.
             if (_converse.connection.connected) {

src/headless/converse-core.js

@@ -435,7 +435,7 @@ function finishInitialization () {
 
 function unregisterGlobalEventHandlers () {
     document.removeEventListener("visibilitychange", _converse.saveWindowState);
-    _converse.emit('registeredGlobalEventHandlers');
+    _converse.emit('unregisteredGlobalEventHandlers');
 }
 
 function cleanup () {