Steps: Open KDevelop 5.1.2 Open the Filesystem pane on the left. MISSING: "Lock" the filesystem view, by clicking a "lock" or "pin" icon. Doubleclick a subfolder. Expected: The subfolder expands/collapses. Actual: The subfolder is made the current folder of the filesystem view, irreversibly losing all collapse/expand state. This is especially problematic because you can easily click/doubleclick a folder by accident.