To reproduce: compare 2 empty files. In Settings, make sure "Smart tab 
char" in on. On the right, insert 1 line with 1 character and a newline. 
Select the line. Press tab (and seek cover).

I filed this under TortoiseGit 
<https://gitlab.com/tortoisegit/tortoisegit/issues/3449> but noticed the 
code was copied from TortoiseSVN. Digging further, the bug comes from a 
single changeset 25713 by one Stefan K, specifically to "improve 
auto-detection of tab-mode" which replaced the safe code above ? 
GetViewLine(i)[0] : '\0' with the one crashing now.

Apart from the bug I have some remarks about the 
CBaseView::GetIndentCharsForLine code here:

   - if (line.GetLength() > m_nTabSize): if it counted the number of 
   leading spaces, I would understand. But just length, how is that a hint 
   that spaces are wanted? Anyway, the fact that lines usually are longer is 
   the reason nTabMode is set and the crashing code is skipped.
   - bool above = i > 0... and not >= 0 while in this example y = 0 and 
   GetViewLine(y) indeed returns the first line. So if there's a tab on the 
   line above, we want to insert tabs, but not if that line is the first line??
   - nTabMode = 1 (meaning spaces) if both the nth line above and nth line 
   below are longer than tab size. Even if I understood that rule, why not if 
   the 1st line above is longer, the 1st line below is not, but the 2nd line 
   below is longer?
   - if (m_nTabMode & TABMODE_SMARTINDENT): why twice? Probably the good 
   intent was to move the nTabMode == -1 test out of the for loop to this 
   more visible place (hence the not-yet-useful break statements inside the 
   loop).

Stein

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