* lisp/org-colview.el (org-columns-compute): Properly summarize values
obtained through inline tasks.
* testing/lisp/test-org-colview.el (test-org-colview/columns-update):
Add test.
Previously, the summary of values from inline tasks was added to to the
summary of values from children.
* lisp/org-colview.el (org-columns--overlay-text): New function.
(org-columns--display-here): Use new function.
(org-columns-update): Properly handle additional decorations to
displayed values (e.g., ellipses).
* testing/lisp/test-org-colview.el (test-org-colview/columns-update):
New test.