[Tcl-bugs] [ tktoolkit-Bugs-1456342 ] slow deletion of whole text widget content/"sliced" deletion

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Bugs item #1456342, was opened at 2006-03-22 18:38
Message generated for change (Settings changed) made by dkf
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Category: 18. [text]
>Group: current: 8.4.12
Status: Open
Resolution: None
>Priority: 8
Submitted By: Luc Moulinier (luckyluke67)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: slow deletion of whole text widget content/"sliced" deletion

Initial Comment:
When a text widget contains a lot of data (i.e. 350
lines of 2000 characters, with a total of 250 000
characters tagged), the deletion of the content of the
widget text is very slow using the normal command : $w
delete 1.0 end (say 2-3 Minutes). If the same widget is
deleted in a "sliced" way :

set nl [lindex [split [$w index end] .] 0]
while {$nl <= 30} {
     $w delete 1.0 30.end
     incr nl -30
}
$w delete 1.0 end

takes few Seconds !!!

This behavior seems not to be normal , and has benn
reported since Tcl/Tk version 8.3.4.

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Comment By: Nobody/Anonymous (nobody)
Date: 2006-03-22 23:52

Message:
Logged In: NO 

FYI. In cvs HEAD this was fixed (I think as part of one of
the text widget TIPs):

	/*
	 * We are deleting more than one line. For speed, we remove
all tags
	 * from the range first. If we don't do this, the code
below can (when
	 * there are many tags) grow non-linearly in execution time.
	 */



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