This is the default since forever, so don't change it on the users, no matter what is the new default in Scintilla 3.10.0.
Fixes #2010. You can view, comment on, or merge this pull request online at:
https://github.com/geany/geany/pull/2011
-- Commit Summary --
* Revert to previous modifier for creating rectangular selections
-- File Changes --
M src/editor.c (3)
-- Patch Links --
https://github.com/geany/geany/pull/2011.patch https://github.com/geany/geany/pull/2011.diff