Please describe the problem:
while entering some text the fontsize changes unconditionally (especially when 
zoomed far out). also when exporting to png (others not tested) the letters 
are broken (only the lower 2/3 of the font is visible) when exported to large 
pictures. 

Steps to reproduce:
1. zoom out  
2. enter some text 
 
 

Actual results:
font size changes when entering letters (nearly at every letter)  

Expected results:
font size not changing  

Does this happen every time?
yes 

Other information:
this is the corresponding console output: 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000. 
 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000. 
 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000. 
 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000. 
 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000. 
 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000. 
 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000. 
 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000. 
 
** (dia:7179): WARNING **: Failed to appropriately tweak zoomed font for zoom 
factor 10.000000.