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My point is that: when I use Increase Indent , TP is changing spaces in tabs.

Set the tabstop to four, paste the sql code of my first message, select the code, press TAB, check the spaces: some of them have been converted to space.

At least, this is what happens to me. If you do not have the same ...

Have you unchecked " Convert New tabs to Spaces " and
" Convert Existing Tabs to Spaces When Saving Files " for the
relevant document class?

Yes, the "Tabulation" tab has:
- Default Tab Spacing = 4
- Indent Size = 4
- Convert new Tabs to Spaces = unchecked
- Convert existing Tabs to Spaces when ...

When I use the Increase Indent toolbar command (or just hitting TAB on a block of selected text), TextPad 4.7.1 not only adds a TAB char to any row selected, but also converts the spaces at the beginning of the same rows in TABs.

I generally use a mixed approach during the indent of my texts ...