Doxygen doesn't correctly treat nested \if statements

[StefanBattmer]

Describe the bug
Parts of the documentation of the top level \if statement (enabled vis ENABLED_SECTIONS in the doxyfile) end up in the documentation. This is correct but parts from the \else statement end up being in the output as well. I did test this with 1.9.6 and even 1.8.10. Same result.

Expected behavior
Only the enabled stuff should end up being documented

Screenshots

To Reproduce
I attached a version reproducing the effect. Removing BUILD_WITH_A from the ENABLED_SECTIONS results in correct output. This might be related to the fact that then only the \else branch is touched.

Version
1.9.6 but also 1.8.10

DoxygenIssue.zip

[albert-github]

Problem is also present when using \elseif.

[albert-github]

I've just pushed a proposed patch, pull request #9789

[StefanBattmer]

@albert-github: Just to make sure: Shall we test this on our end now? I am just asking because the Build of the pull request wasn't successful.

[albert-github]

That would be much appreciated, you can use the proposed patch at your side (with the current master as base).
The problem with the build of the pull request was just a minor problem in building internal documentation (that already has been fixed in the master version). The failure of the build of the proposed patch does not have anything to do with the proposed patch.

[albert-github]

Code has been integrated in master on GitHub (please don't close the issue as this will be done at the moment of an official release).

[StefanBattmer]

@albert-github: I can confirm that this patch does the job! Thanks!

[doxygen]

This issue was previously marked 'fixed but not released',
which means it should be fixed in doxygen version 1.9.7.
Please verify if this is indeed the case. Reopen the
issue if you think it is not fixed and please include any additional information
that you think can be relevant (preferably in the form of a self-contained example).