[PD] Some patches broken in 0.49test3

[Roman Haefeli]

Hi

Sorry, need to report something probably more serious. Some of my
patches trigger messages like the following:


(Tcl) INVALID COMMAND NAME: invalid command name ".x558795b0c400.c"
    while executing
".x558795b0c400.c itemconfigure 558795b682c0LABEL -font {{DejaVu Sans Mono} -11 bold}"
    ("uplevel" body line 10)
    invoked from within
"uplevel #0 $docmds"


Side effects are that sometimes the label of [cnv] is not updated. Or
the canvas stays blank after dynamically creating stuff and objects are
only shown after closing the window and opening it again. 

I don't have a small patch yet that triggers the problem, but will try
to figure one out.

BTW.: this is with  0ee284ecfb5215
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