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patch 9.1.0218: Unnecessary multiplications in backspace code

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Problem:  Unnecessary multiplications in backspace code, as
          "col / ts * ts" is the same as "col - col % ts".
Solution: Change "col / ts * ts" to "col - col % ts".  Adjust the loop
          and the comments ins_bs() to be easier to understand.  Update
          tests to reset 'smarttab' properly.
          (zeertzjq)

closes: #14308

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq
2024-03-28 10:30:08 +01:00
committed by Christian Brabandt
parent 2ca7d5f483
commit 8ede7a0694
4 changed files with 47 additions and 26 deletions
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4
src/indent.c
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@@ -163,7 +163,7 @@ tabstop_start(colnr_T col, int ts, int *vts)
int excess;
if (vts == NULL || vts[0] == 0)
return (col / ts) * ts;
return col - col % ts;
tabcount = vts[0];
for (t = 1; t <= tabcount; ++t)
@@ -174,7 +174,7 @@ tabstop_start(colnr_T col, int ts, int *vts)
}
excess = tabcol % vts[tabcount];
return excess + ((col - excess) / vts[tabcount]) * vts[tabcount];
return col - (col - excess) % vts[tabcount];
}
/*