1 files changed, 19 insertions, 0 deletions
diff --git a/comm/chat/modules/imTextboxUtils.sys.mjs b/comm/chat/modules/imTextboxUtils.sys.mjs
new file mode 100644
index 0000000000..979abb6f61
--- /dev/null
+++ b/comm/chat/modules/imTextboxUtils.sys.mjs
@@ -0,0 +1,19 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+export var TextboxSize = {
+  _textboxAutoResizePrefName: "messenger.conversations.textbox.autoResize",
+  get autoResize() {
+    delete this.autoResize;
+    Services.prefs.addObserver(this._textboxAutoResizePrefName, this);
+    return (this.autoResize = Services.prefs.getBoolPref(
+      this._textboxAutoResizePrefName
+    ));
+  },
+  observe(aSubject, aTopic, aMsg) {
+    if (aTopic == "nsPref:changed" && aMsg == this._textboxAutoResizePrefName) {
+      this.autoResize = Services.prefs.getBoolPref(aMsg);
+    }
+  },
+};