Looking at your code on github, it's because of this:
my $canvas = $Mainwin->Scrolled('Canvas')->grid;
my $real = $canvas->Subwidget("canvas");
Based on your choice of the variable name $real, you seem to already know what the issue is here :) $canvas isn't a 'Canvas'. | [reply]
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Hey, I always wondered was real meant in this way.. I think I just copied from TextUndo tricks I had to use somewhere else. Maybe it's not of any use here.
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No I'm sorry, removing this workaround doesn't change anything, and I'll have to try your first proposal... In the meantime I found where this comes from: I had experienced key-binding problems in Scrolled TextUndo widgets and could apply with success Zentara's tip given here Re^3: Tk hidden binding, so to be on the safe side, as my canvas is scrolled too, I just applied the same here in prevision of possible key-bindings and problems. Anyway, I must acknowledge I often copy and paste bits of code without always being sure they're appropriate, when it works no further verification is made (shame on me!).
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