Bug 1792748 - Persist sidebar style attribute rather than width attribute. r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D158291

browser/base/content/browser-box.inc.xhtml

@@ -3,7 +3,7 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 <hbox flex="1" id="browser">
-  <vbox id="sidebar-box" hidden="true" style="min-width: 14em; width: 18em; max-width: 36em" class="chromeclass-extrachrome">
+  <vbox id="sidebar-box" hidden="true" class="chromeclass-extrachrome">
     <box id="sidebar-header" align="center">
       <toolbarbutton id="sidebar-switcher-target" class="tabbable">
         <image id="sidebar-icon" consumeanchor="sidebar-switcher-target"/>

browser/base/content/browser-sidebar.js

@@ -144,7 +144,7 @@ var SidebarUI = {
         xulStore.removeValue(document.documentURI, "sidebar-box", "checked");
       }
 
-      xulStore.persist(this._box, "width");
+      xulStore.persist(this._box, "style");
       xulStore.persist(this._title, "value");
     }
 
@@ -345,10 +345,7 @@ var SidebarUI = {
       return true;
     }
 
-    this._box.setAttribute(
-      "width",
-      sourceUI._box.getBoundingClientRect().width
-    );
+    this._box.style.width = sourceUI._box.getBoundingClientRect().width + "px";
     this.showInitially(commandID);
 
     return true;

browser/base/content/browser.css

@@ -1482,6 +1482,12 @@ printpreview-pagination:focus-within,
   }
 }
 
+#sidebar-box {
+  min-width: 14em;
+  max-width: 36em;
+  width: 18em;
+}
+
 /* WebExtension Sidebars */
 #sidebar-box[sidebarcommand$="-sidebar-action"] > #sidebar-header > #sidebar-switcher-target > #sidebar-icon {
   list-style-image: var(--webextension-menuitem-image, inherit);

browser/base/content/test/sidebar/browser.ini

@@ -4,4 +4,5 @@
 [browser_sidebar_app_locale_changed.js]
 [browser_sidebar_keys.js]
 [browser_sidebar_move.js]
+[browser_sidebar_persist.js]
 [browser_sidebar_switcher.js]

browser/base/content/test/sidebar/browser_sidebar_persist.js

@@ -0,0 +1,37 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function persist_sidebar_width() {
+  {
+    // Make the main test window not count as a browser window any longer,
+    // which allows the persitence code to kick in.
+    const docEl = document.documentElement;
+    const oldWinType = docEl.getAttribute("windowtype");
+    docEl.setAttribute("windowtype", "navigator:testrunner");
+    registerCleanupFunction(() => {
+      docEl.setAttribute("windowtype", oldWinType);
+    });
+  }
+
+  {
+    info("Showing new window and setting sidebar box");
+    const win = await BrowserTestUtils.openNewBrowserWindow();
+    await win.SidebarUI.show("viewBookmarksSidebar");
+    win.document.getElementById("sidebar-box").style.width = "100px";
+    await BrowserTestUtils.closeWindow(win);
+  }
+
+  {
+    info("Showing new window and seeing persisted width");
+    const win = await BrowserTestUtils.openNewBrowserWindow();
+    await win.SidebarUI.show("viewBookmarksSidebar");
+    is(
+      win.document.getElementById("sidebar-box").style.width,
+      "100px",
+      "Width style should be persisted"
+    );
+    await BrowserTestUtils.closeWindow(win);
+  }
+});

browser/components/BrowserGlue.jsm

@@ -3511,7 +3511,7 @@ BrowserGlue.prototype = {
   _migrateUI: function BG__migrateUI() {
     // Use an increasing number to keep track of the current migration state.
     // Completely unrelated to the current Firefox release number.
-    const UI_VERSION = 128;
+    const UI_VERSION = 129;
     const BROWSER_DOCURL = AppConstants.BROWSER_CHROME_URL;
 
     const PROFILE_DIR = Services.dirsvc.get("ProfD", Ci.nsIFile).path;
@@ -4287,6 +4287,26 @@ BrowserGlue.prototype = {
       }
     }
 
+    function migrateXULAttributeToStyle(id, attr) {
+      try {
+        let value = Services.xulStore.getValue(BROWSER_DOCURL, id, attr);
+        if (value) {
+          Services.xulStore.setValue(
+            BROWSER_DOCURL,
+            "style",
+            `width: ${value}px;`
+          );
+        }
+      } catch (ex) {
+        Cu.reportError(`Error migrating ${id}'s ${attr} value: ` + ex);
+      }
+    }
+
+    // Bug 1792748, migrate sidebar persisted attribute from width to style.
+    if (currentUIVersion < 129) {
+      migrateXULAttributeToStyle("sidebar-box", "width");
+    }
+
     // Update the migration version.
     Services.prefs.setIntPref("browser.migration.version", UI_VERSION);
   },