Currently, layout debug code is not build by default, even when compiling with --enable-debug set. (This, btw, renders the user_pref xul.debug.box in the Seamonkey preferences pretty useless!) We should have either --enable-debug include DEBUG_LAYOUT also or have an ac_add_options to easily allow DEBUG_LAYOUT to be specified.
And another BTW: DEBUG_LAYOUT is pretty broken, too, at the moment...
The only references to DEBUG_LAYOUT I see today are #ifdef in .h and .cpp files: there's nothing in the build system. Since 12 years have passed, I'm going to say this bug isn't worth doing. I've CCd dbaron just in case he has an opinion.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → INCOMPLETE
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