When upgrading TW single file, from 5.1.17 to 5.1.19 on Windows8.1/latest Firefox, I noticed a sizeable file size decrease from 4,926 kb to 4,430 kb
all I noticed tiddlers numbers wise (from control panel, info tab)
Number of tiddlers: 1642 (pre-upgrade)/ 1642 after
Number of tags: 512 / 512
Number of system tiddlers: 2252 / 83
Number of shadow tiddlers: 1813 / 1881
Number of overridden shadow tiddlers: 30 / 28
No content appeared to be lost. Even all my custom non-core system (given the $:/ prefix) tiddlers (macros, stylesheets, cloned, modified, given a special $:/.rags tiddler title prefix core tiddlers) all transfered over.
I wasn't running any installed plug-in's or modified core system tiddlers other than 1 manual edit to the vanilla stylesheet and those changed by control panel settings.
I figured it might be old temp tiddlers being left out-- the drastic decrease in system tiddlers, but in the upgrade tiddler list I noticed a lot of state tiddlers included. I figured the file size will build back up as the TW is used and "use settings" made during use get restored.
Strange idea-- would this be a way to "refresh" a TW, clearing built up bloat? Can an upgrade be used on the same version TW again?