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Comparing two text files in which one has tabs and the other has not (only blanks) and checking "ignore white space: all", the difference markers disappear but the lines are still marked as "Changed".

I could not reproduce this (see lines 7 below, space versus tab between "Symbolic" and "Constants").

I'm now unable to replicate it since I modified the files that showed the problem.
It seemed so simple...
I'll try to recreate the situation.
Thanks for now.

Ah, things are never so simple as they seem!
The problem is not (only) in the blank/tabs. The behaviour is far more complicated.
Modify a line (the last one) so that it's "unchanged" and all of a sudden also the previous three lines are shown correctly...
Try with the attached files.

I'm a little confused I'm afraid: what is the incorrect result that you see initially? When I compare your files, I see the last 4 lines as identical, which seems correct to me. A screenshot and your options will help.

To begin with, let me say that the result someitmes depends also on where you come from, a thing that makes me call it a bug.

Detail level: lines and character.
Ignore: nothing.
You can see the difference between tabs and blanks and all the lines are different: OK.
Now: ignore all the white space.
All the lines (except the one with "high") should be "equal" but only the last 4 are shown as such!
(And this depends on how the last line is composed!)
N.B. (Problem unchanged in 7.0.1.12)

I have to disagree. The first 13 lines on the left are also missing a semicolon, hence the differences.

Gosh! You're absolutely right!
And I also used the line inspector!

I'm still convinced I saw something odd, but for now it's much better if I shut up.
Sorry.