tree 805aeeaafe6ed4ef79341b7dd2f71fa4a8f41e72
parent 9d6d5b679ac66c28eb98194619cc37e10e4bc87c
author Benno Schulenberg <bensberg@justemail.net> 1462376977 +0200
committer Benno Schulenberg <bensberg@justemail.net> 1462383909 +0200

spelling: don't partition the file for replacements in a marked region

Partitioning the file makes the undo system lose track, so that undoing
things has a good chance of losing data.  Instead, just make sure that
the region is marked "backwards", with current at the top and the mark
at the bottom, and then let the replace loop take care of not going
outside of the marked region.

This also has the effect that if the marked region fits entirely on the
screen, or all the misspellings are onscreen, then the screen will not
be scrolled at all.  Which makes for a smooth experience.

This fixes https://savannah.gnu.org/bugs/?47836,
and fixes https://savannah.gnu.org/bugs/?45573.