A tool window's Options menu gets a View Mode submenu with Dock Pinned (the default), Dock Unpinned and Undock, as actions `toolwindow.viewMode.dockPinned|dockUnpinned|undock` (category Window). Unpinned and undocked windows hide when focus moves to the editor or another tool window, not to a popup, menu or dialog; an undocked window lies over the editor at its side without resizing it, and its inner edge resizes it. The mode is kept per window in the project layout, saved with Tool Window Layouts and reset by Restore Default Layout.
A menu button in a tool window now takes focus when clicked: WebKit doesn't focus clicked buttons, so the menu returned focus to the editor on close and hid a window just switched to Dock Unpinned or Undock.
Co-authored-by: formiat <29867335+formiat@users.noreply.github.com>
