Steps to reproduce: 1) Open an empty Writer document. 2) Open a second window using Window -> New window. Notice that both cursors are at paragraph 0, character position 0. 3) Start typing in the first window. Expected behavior: cursor in the second window stays unchanged. Actual behavior: cursor gets moved with the cursor of the other window. There are a couple of other elements that don't move when typing at the cursor position (bookmarks, at-character anchored pictures, etc), the cursor of other windows could have the same behavior, I guess.
Miklos Vajna committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=ecdec24c035513dbf2ee1814eb437e2a9d9a3d6c tdf#102384 sw: avoid moving cursors of other windows in SwTextNode::Update() It will be available in 5.3.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.