Edit some content in editor,the content divided into two parts, both are set different font size, and then I mouse to drag to select all from the bottom up, then the font size of the lower half of the content change to be the same to the upper, but if I select from top to bottom，not happen this situation.

Another scenario, compile 2 paragraphs(or more), set font to Arial-12 for the first paragraph and set font to Courier-8 for the other. Deselect any content then press Ctrl+A to select all, wait a couple of seconds, the font for both of the paragraphs becomes Arial-12.

This happens on all the platform, windows/mac/linux.