Backport !358 (Fix automatic block size detection for leaf spaces) to releases/2.6
Fix automatic block size detection for leaf spaces
Closes #114 (closed)
See merge request !358 (merged)
(cherry picked from commit 24d5aee0)
11ddf145 [ISTL] Make sure blocking is detected correctly for leaf spaces when block size is autodetected 89d67f03 [test] Add test for autodetected ISTL block size handling