Dear Uwe, dear LyX developers, looking at the latest changes in Math.lyx, I see
1. The protected space before the button-icons replaced by an ordinary space. This may lead to line breaks before the icon, e.g. ....... ....... ... ......... .... den Werkzeugleistenknopf [TeX] oder den Menüeintrag. is this intended? 2. The size set to 12pt. This is better than my idea of scaling, but I recommend using a measure that changes with the font size: \begin_inset Graphics filename ../../images/math/vphantom.svgz lyxscale 14 - height 12pt + height 1em \end_inset (of course also for the other svgz icons). This keeps the size if the font size is kept at 12pt¹ but adapts, if a user wants a different size and is hence the "right thing to do" here. ¹which is actually a bit larger than the letter-height so that line spacing is increased before lines containing a toolbar icon. 3. Many icons inset using a secial info inset (where is this inset documented?) Unfortunately, many of these icons have the wrong size in the PDF: either too large [math-insert \leq] or too small, or with content non-centered and partly invisible [ert-insert]. Günter