- The sidebar can be now be resized by dragging the divider (closes #3447)

- Dragging the sidebar below a minimum size collapses it
- A button in the top toolbar lets you uncollapse the sidebar, complete with icon and tooltip
- Double-clicking the divider toggles the sidebar collapse
- Collapse-toggling is animated
- Selecting a feature or ending an add-feature mode auto-opens the sidebar
- Photoviewer UI has been moved from init.js to photoviewer.js
- The photoviewer now has a slight margin to set it away from the sidebar
- The undo/redo, save, and progress indicator controls are now floated to the right
- The save count has been redesigned to visually integrate with the save button
- When the sidebar is collapsed, the mode buttons are centered
- Full right-to-left layout support for all of the above

data/core.yaml

@@ -294,6 +294,9 @@ en:
   loading_auth: "Connecting to OpenStreetMap..."
   report_a_bug: Report a bug
   help_translate: Help translate
+  sidebar_button:
+    title: Sidebar
+    tooltip: Open the sidebar.
   feature_info:
     hidden_warning: "{count} hidden features"
     hidden_details: "These features are currently hidden: {details}"