SQL pane freezes while editing

Dev 1.17, wxwidgets 2.9.3

Some time ago I reported that my pgadmin SQL editor showed freeze 
behaviour under certain conditions:
multiple SQL lines
containing parentheses
remove one left parenthesis, then try to put it back,
pane freezes, with or without disappearance of text
replaced by a light blue background
freeze can be removed by using mouse to drag horizontal slider forth and 
back.

This appears to be related to the 'word wrap' setting.
Default editor word wrap setting is off.
Using word wrap off, above behaviour is observed.
Switch word wrap on, behaviour is not observed.
Anyone else see this?
-- 
---
Colin Beckingham
613-454-5369
http://www.it4gh.com