Reason:
	In viewer 2 was added ability to set aspect ratio while previewing textures. It was achieved by resizing the floater containing a texture, instead of proportionally resize the texture. The problem happened when multifloater was opened with texture preview floaters and for some floaters textures was not loaded yet.After texture was loaded, the floater (in multifloater) which contained just loaded texture resized to fit with the new texture's size and texture preview floaters screwed up from the multifloater.

Solution: 
        Proportionally resizing a texture inside the floater instead of the floater itself.

Also two issues was fixed: 1. when floater resized the texture streched in the floater and lost its proportions. 2. When docking texture floater to the multifloater, multifloater resized to fit with docked floater and other texture lost their proportions.