Too big math preview in 1.5.0 orc1, solution

[Jean Kaplan]

I found a solution to reduce (or increase) the size of math previews  
on the lyx screen (at least for mac os X 10.4.9, mac ppc):
Go to the menu item "Preferences->Look and feel-> screen fonts",  
decrease (or increase) the "Screen DPI" and save this changes the  
size of math previews without changing the size of the text. To see  
the result you have to quit lyx and start again, the button "apply"  
does not seem to work for this item.
A tip to get the math preview size adequate to the text : write a  
math formula including an \mbox{ some text }, then proceed by trial  
and error.

What I do not understand is why this math preview becomes too large  
when going from version 1.4.4 to 1.5.0 orc1
Jean