Tcl/Tk 8.6b1のChangeLogを眺めていると
2008-11-22 Donal K. Fellows <dkf@users.sf.net>

TIP #119 IMPLEMENTATION

* generic/tkCanvText.c: Added -angle configuration option to canvas
* generic/tkFont.c: text items. This required reengineering the
* library/prolog.ps: whole text rendering engine to be able to
* macosx/tkMacOSXFont.c: handle an angle! No change to any external
* unix/tkUnixFont.c: API. Note, this feature was originally
* unix/tkUnixRFont.c: approved for Tk 8.5, but it has proved much
* win/tkWinFont.c: harder to implement than originally
* generic/tkInt.h: estimated. [Patch 1611359]
* tests/canvText.test:
にて、Canvas上のTextに回転(-angle)オプションが導入されたようです。

この機能は、SADがパッチで実装している -rotateオプションの実装コードと衝突しています