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I randomly see some graphics glitch on Emacs on OS X Terminal. Here's what I see while pushing space bar.

enter image description here

And here's what actually saved. (I checked this by c-x, c-c and reloading the file)

enter image description here

Why this happen and how to fix this?

Update

Here's some additional descriptions to @lunaryorn's advise.

  1. This is randomly reproducible. (for different keystroke, but it eventually happens, mostly for each session),
  2. I installed Emacs using Homebrew (brew install emacs)
  3. I want Unix experience instead of Mac experience. I am trying Emacs to learn as an universally available editor on any Unix environment, not Mac specific usage.
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migrated from stackoverflow.com Mar 23 '13 at 21:57

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Is this issue reproducible, i.e. does it happen any time you're using Emacs in terminal? How did you install Emacs? And last, why aren't you using a graphical Emacs? –  lunaryorn Mar 24 '13 at 15:56
1  
Oh dear… a GUI Emacs is not less “Unix experience” than a terminal Emacs. After all, it's Emacs, in either of these cases. You will be able to use it exactly the same way, except that the GUI is much nicer, because it has more display and editing capabilities, including fringe icons, full RGB colors (= fancier color themes), clipboard access, modifier re-mapping, etc… The latter is especially nice on OS X, because you can re-map Alt to Command, which is easier to reach while typing. –  lunaryorn Mar 25 '13 at 19:09
    
@lunaryorn Thanks for advising. I can agree GUI Emacs would be pretty same. But anyway, my main goal is having an ability to work on complete CUI environment (in other words completely mouse-less, windows-less), and Emacs is just a tool for it. So using GUI Emacs is somewhat out of my goal :P –  Eonil Mar 25 '13 at 19:56

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