Used debounce ineffectually. Fixed now.

The ChatBox.show() method was being called for every invocation, 100ms after
the fact, instead of it being called only once.

Fixed that and also changed to call it at the start.

src/converse-core.js

@@ -1429,7 +1429,7 @@
                     converse.incrementMsgCounter();
                 }
                 if (!this.model.get('minimized') && !this.$el.is(':visible')) {
-                    _.debounce(this.show.bind(this), 100)();
+                    this.show();
                 }
             },
 
@@ -1830,7 +1830,7 @@
                 return this;
             },
 
-            show: function (focus) {
+            show: _.debounce(function (callback) {
                 if (this.$el.is(':visible') && this.$el.css('opacity') === "1") {
                     if (focus) { this.focus(); }
                     return this;
@@ -1849,7 +1849,7 @@
                     }
                 }.bind(this));
                 return this;
-            },
+            }, 250, true),
 
             scrollDownMessageHeight: function ($message) {
                 if (this.$content.is(':visible')) {