now it's no problem with chinese character and alphabet.
it's the problem with tab and spaces.
someone could try with indentation with 3 spaces, 4 spaces, 6 spaces, 7 spaces, 8 spaces.
at first, i think it's because to show a space between tabs, it's why it seems that it's ok with 3 spaces.
buy if your try tab's width is 8 spaces (less or more one space), you'll find it's cannot get well indentation.
test strings:
`測試測試測試測試測試測試測試測試測試測試測試測試 testtesttesttesttesttesttesttesttesttesttesttest 1122334455667788990011223344556677889900 abcdefghijklmnopqrstuvwxyz ABCEEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz`
  
Closed #3710 as completed.
maybe it's problem with my customized font, i'll try again. it seems that it has no problem with "deja vue sans mono book" font
Hint, monospaced, the width of tabs shown is the width of the specified number of ASCII space characters in the current default font.
With non-monospaced fonts that may be less than the width of the same number of other characters, and that width may depend on the number of spaces in a row.
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