steps to reproduce: $ : > /tmp/a $ kate /tmp/a type space into opened file. you will see "modified" icon (floppy). open new window. it will not have this icon. Also, I often see that one window has "modified" icon and another window has not in different situations. So, double check that this icon is always synchronized. version 16.08.2 on debian stretch
Indeed, this is a bug. Proposed fix is under review: https://git.reviewboard.kde.org/r/129754/
Git commit 43192b4580f160e82ca9fbb4eba269071d6592f9 by Dominik Haumann. Committed on 08/01/2017 at 15:44. Pushed by dhaumann into branch 'Applications/16.12'. Fix: modified-icon not synchronized between different windows REVIEW: 129754 M +1 -0 kate/kateviewspace.cpp https://commits.kde.org/kate/43192b4580f160e82ca9fbb4eba269071d6592f9