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cell merge bug not only when merging cells

• To: mathgroup at smc.vnet.net
• Subject: [mg129012] cell merge bug not only when merging cells
• From: Fred Simons <f.h.simons at tue.nl>
• Date: Sat, 8 Dec 2012 01:31:16 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• Delivered-to: l-mathgroup@wolfram.com
• Delivered-to: mathgroup-newout@smc.vnet.net
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I just ran into another situation where one might loose code.

Enter the following three lines in an input cell:

a=1;
(* comment *)
a=2;

Then select the three lines and comment them out by pressing alt-/. That 
works fine. Then undo the action by pressing alt-/ again. The same bug 
as with cell merging turns up. Fortunately, here Rolf Mertig's very 
useful fix works as well.

The same happens when we use a blank line instead of (* comment *).

Fred Simons
Eindhoven University of Technology