GL_REPEAT and non-power-of-2 textures

I have been testing IMG's 1.5 SGX drivers and might have found an issue in Qt.
In the attached application+screenshot, the same text is displayed in different font sizes. Only one size of text will result in a power-of-2 texture and display correctly.

The problem is that, as per the GLES2 spec, and as implemented in v1.5 of the IMG SGX drivers, it is an error to create a non-power-of-2 texture with GL_REPEAT wrap mode, and the texture will turn opaque black.

I know that you are already aware of this issue, and provided some fixes elsewhere in Qt's GLES2 engine ; do you know why GL_CLAMP_TO_EDGE was not used instead here ?