I'm still investigating, but have some results and a
simplification of the test case:
> Text to find: '[ab]'
> as a regexp
"As a regexp" is needed, but the text to find can be simply 'a'.
> Replace with: '\\0'
> with backreferences allowed
Kate's dialog calls backrefs "placeholders".
Following these instructions, you must also click "continue from
beginning" when prompted.
Behaviour with various replacement strings:
\1\1 (with text to find '([ab])'
Works correctly (result is 'aabbc')
\1\1 (with text to find '[ab]'
Correct error message that the pattern lacks a capture.
\\z
'\\z' appears in the text - the escape sequence isn't
converted to single backslash.
\\0
\\1
\\9
All of these result in a freeze.
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