A focus policy
. The window manager
gives the keybooard focus
to the window
the mouse pointer
This is almost never the default, but nonetheless probably the most common focus policy used on X; it's also available on Windows if you install TweakUI, but doesn't work well.
- If you (or someone else) jog the mouse accidentally, keystrokes may be lost or even go to some other window.
- May still need to click to focus on a particular text field of the window.
- When pointing at the background, nothing gets keystrokes (except maybe the window manager).
- Interacts poorly with dialog boxes and keyboard-driven focus changes.
- The mouse pointer must remain in the window, obscuring a portion of it (although some applications, e.g. (X)Emacs with mouse-avoidance-mode, will warp the pointer when it gets in the way of typing).