1 files changed, 48 insertions, 0 deletions
diff --git a/devtools/client/styleeditor/test/browser_styleeditor_sv_resize.js b/devtools/client/styleeditor/test/browser_styleeditor_sv_resize.js
new file mode 100644
index 000000000..d684905fc
--- /dev/null
+++ b/devtools/client/styleeditor/test/browser_styleeditor_sv_resize.js
@@ -0,0 +1,48 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that resizing the source editor container doesn't move the caret.
+
+const TESTCASE_URI = TEST_BASE_HTTP + "simple.html";
+
+const {Toolbox} = require("devtools/client/framework/toolbox");
+
+add_task(function* () {
+  let { toolbox, ui } = yield openStyleEditorForURL(TESTCASE_URI);
+
+  is(ui.editors.length, 2, "There are 2 style sheets initially");
+
+  info("Changing toolbox host to a window.");
+  yield toolbox.switchHost(Toolbox.HostType.WINDOW);
+
+  let editor = yield ui.editors[0].getSourceEditor();
+  let originalSourceEditor = editor.sourceEditor;
+
+  let hostWindow = toolbox.win.parent;
+  let originalWidth = hostWindow.outerWidth;
+  let originalHeight = hostWindow.outerHeight;
+
+  // to check the caret is preserved
+  originalSourceEditor.setCursor(originalSourceEditor.getPosition(4));
+
+  info("Resizing window.");
+  hostWindow.resizeTo(120, 480);
+
+  let sourceEditor = ui.editors[0].sourceEditor;
+  is(sourceEditor, originalSourceEditor,
+     "the editor still references the same Editor instance");
+
+  is(sourceEditor.getOffset(sourceEditor.getCursor()), 4,
+     "the caret position has been preserved");
+
+  info("Restoring window to original size.");
+  hostWindow.resizeTo(originalWidth, originalHeight);
+});
+
+registerCleanupFunction(() => {
+  // Restore the host type for other tests.
+  Services.prefs.clearUserPref("devtools.toolbox.host");
+});