I just rediscovered column select mode and I found a potential problem:
In a SQL window, type "select 1 from dual". Hold down ALT and select the text: selection works fine.
Now put 5 blank lines before the text, and try to ALT-select it again: selection starts 5 characters to the right of the mouse cursor.
A similar problem happens in some (large) package bodies. Log in as SYS and open the body for the OWA_UTIL package. Scroll all the way down and ALT-select some text: selection starts to the left of the cursor. Selecting text closer to the top of the package works fine.
(PL/SQL Developer 6.0.2.880)
In a SQL window, type "select 1 from dual". Hold down ALT and select the text: selection works fine.
Now put 5 blank lines before the text, and try to ALT-select it again: selection starts 5 characters to the right of the mouse cursor.
A similar problem happens in some (large) package bodies. Log in as SYS and open the body for the OWA_UTIL package. Scroll all the way down and ALT-select some text: selection starts to the left of the cursor. Selecting text closer to the top of the package works fine.
(PL/SQL Developer 6.0.2.880)