polylinesegment skip locked or hidden entities
add undo support for plugins bug #3579202
dxfrw: fixed an osx crash, possibly bug#3597944
actionDefault: avoid using invalid ref point, bug#3587192
ellipse: fixed detection for within viewport, bug#3581669
filterdxfrw: save correct extension var header
applicationWindow: tool widget size policy, bug#3579280
more work needed
mdiwindow: initialized to Preferred size policy
enable undo in remove block, bug #3509368
Merge branch 'master' of github.com:LibreCAD/LibreCAD
Detect KDE for use native or qt filedialog
correct disable ttf2lff if not have freetype in win
filters: do not save undone blocks