clang-format toggles between two different formattings

[Quuxplusone]

Bugzilla Link	PR40583
Status	NEW
Importance	P normal
Reported by	Frank Hoffmann (fhoffmann@softwareparadies.de)
Reported on	2019-02-04 05:04:20 -0800
Last modified on	2019-08-03 13:26:43 -0700
Version	7.0
Hardware	PC Windows NT
CC	djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org, sebastian@pipping.org
Fixed by commit(s)
Attachments	report.zip (2220 bytes, application/x-zip-compressed)
Blocks
Blocked by
See also	PR42509

Created attachment 21424
minimized clang format files and source code examples

Clang toggles between two different formattings in some special cases.
This makes it impossible to use because there is no "correct" formatted code
any more.

example toggle1:

<     int maxH = ftoi((float)((aaaaaaaaaaa - iiiiiiiiiiiiiiiiii)
<                             / h)); // iiiiiiiiiiiiii llll     iiiii
aa.aa.aaaa aaaa iiiii pppp-1111
---
>     int maxH =
>         ftoi((float)((aaaaaaaaaaa - iiiiiiiiiiiiiiiiii)
>                      / h)); // iiiiiiiiiiiiii llll    iiiii aa.aa.aaaa aaaa
iiiii pppp-1111

I could not find one specific example which explains all the problems, so I
have attached 4.

My first Idea was that tabs are the only problem but then I discovered example
4, without any tabs.

I hope the examples will help to find the bug.

OS: Windows 10
clang-format version: 7.0.1

[Quuxplusone]

Attached report.zip (2220 bytes, application/x-zip-compressed): minimized clang format files and source code examples