Pagetree macro's "Expand All" link is cut off

Steps to Reproduce

1. Create a new space
2. Add some pages
3. Go to Browse > Space Admin > Themes and select Documentation Theme
4. Customize the Documentation Theme by clicking "configure theme"
5. Untick "Page tree" and add the following into the "Navigation" textbox:

   {pagetree:expandCollapseAll=true}
   

6. Save the configuration

Expected Results

Pagetree is displayed with "Expand All" link shown correctly

Actual Results

The "Expand All" link is cut off as per the following screenshot:

Environment Information

Reproducible in 5.1.x using all browsers

Workaround

Add the following CSS in Space Admin > Stylesheet:

#splitter-sidebar .plugin_pagetree {
margin-left: 0px !important;
}