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[REBOL] Re: rebocalc bugs with

From: antonr::lexicon::net at: 14-Nov-2004 19:58

View versions <= 1.2.25 the headings seem fine, but View versions >= 1.2.26 show this bug. I investigated by opening each rebol version, doing the following lines of code, then pasting into a text editor so I can make easy comparisons: layout [text with [write clipboard:// join {; } [system/version newline mold init]]] quit write clipboard:// join {; } [system/version newline mold system/view/vid/vid-styles/text] quit If you search for "xy" you can see that the attribute xy has been added to the TEXT style in Rebol/View 1.2.26 This is a bug which happens inevitably when user code extends the face definition with its own attributes (ie. 'xy) The "official", safe way is to put all extra user state data into face/user-data, but most people (including me) can't be bothered because it ends up being too wordy to refer to it, and we are confident of being able to debug it :) (This kind of bug also happens more often when people use such short variable names...) So what to do about it ? Looking at the TEXT style definition, it only uses 'xy as a temporary variable in the INIT code. (The shock!) Therefore I recommend to remove the 'xy attribute from the face definition and wrap the code, which uses xy in INIT, like so: use [xy][ ... ] This should make rebocalc.r work once again. (And it will save a tiny piece of memory for every instance of TEXT and TEXT-based styles). But it will need to be tested first, added to RAMBO, and finally reintegrated into rebol. So, yes, it is worth signalling :) Anton.