When I select some text and click on toolbar's item (dropdown, image gallery etc) selection start shrinking
normal behavior http://prntscr.com/iab12k
and afterward http://prntscr.com/iab1qk
I tried to catch "selectionChange" event but it's not called when selection shrinking
PS: I found the issue. When SCAYT plugin (when it checking words for correctness) works, it's happening
Any ideas?
The reported issue is a known SCAYT issue. Shrinking of text selection is a visual effect only - your text remains be selected. So the issue isn't influenced SCAYT or CKEditor work and doesn't corrupt your content, formatting etc.