GENERATE_HTMLHELP with \msc & \endmsc is broken because of absolute paths in index.hhp since 1.9.3

[XiaoP76]

Describe the bug
If I use \msc & \endmsc tags in a C++ comment and use GENERATE_HTMLHELP=YES, Doxygen fails with the error message:

Running html help compiler...
error: failed to run html help compiler on index.hhp

Running the hhc compiler manually reveals the problem:

d:\bug1.9.3>hhc html\index.hhp
Microsoft HTML Help Compiler 4.74.8702
Compiling d:\bug1.9.3\html\KCASystem.chm
HHC5003: Error: Compilation failed while compiling bug1.9.3\html\msc_inline_mscgraph_1.png.
The following files were not compiled:
bug1.9.3\html\msc_inline_mscgraph_1.png
Unable to open html\index.hhp.

The reason is that Doxygen 1.9.3 generates an absolute path in the index.hhp, e.g.

[FILES]
d:/bug1.9.3/./html\msc_inline_mscgraph_1.png

Doxgen 1.9.2 with the same Doxyfile generates a relative path:

[FILES]
msc_inline_mscgraph_1.png

To Reproduce
Extract the attached zip file bug1.9.3.zip
and run
doxygen Manual.doxygen

Expected behavior
Expected is that the hhc compiler can create the chm file without an error even if \msc comments are used.

Version
Version 1.9.2 is the last one that works as expected.
Versions starting from 1.9.3 till the current 1.10.0 show the bug.

[albert-github]

Looks like that for the MSC graphs the path has been added as well and this is not supported by the hhc compiler.

[albert-github]

I've just pushed a proposed patch, pull request #10755

[doxygen]

This issue was previously marked 'fixed but not released',
which means it should be fixed in doxygen version 1.11.0.
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).

[XiaoP76]

I verified it and it's fixed in 1.11.0.
Thank you :-)