The latest kdiff3 currently shipped with Tumbleweed is unsuitable for everyday use. I, for example, use it as my go-to `git mergetool` and I need that a lot. And it must be reliable and not messing up merge-output. Since the upgrade from 1.8.4 to 1.9.2, many regressions have to be experienced, please see the list of fixed issues below. 

From a distribution point of view, I see two options: Fix-up 1.9.2 like proposed here, or (really!) downgrade to 1.8.5 until a new reliable 1.9 release comes out. I have contributed many fixes to upstream meanwhile.

- Remove GCC 11 build fix:
  * 0001-Explicitly-include-limits-for-compatibility-with-gcc.patch
    now contained in squashed patch
- Add collected fixes from upstream master:
  * 0001-Collected-fixes-from-master.patch
    contains the original and many more fixes:
    + misalignment and wrong conflict resolutions when using manual
      alignment markers
    + uninitialized variables causing crashes
    + hangs and crashes due to wrong loop conditions
    + wrong handling of new-line at end-of-file
    + spurious insertion of empty lines in merge result
    + access of uninitialized iterators causing crashes
    + wrong buffer length calculations causing out-of-bounds access
    + wrong bit-logic causing comments to always be treated as white-space
    + crashes when hitting a key on empty merge results
    + technical details allowing fixes to be cherry-picked

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