changelog
    
    
    - Thu, 03 Mar 2022 11:42:52 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 03 Mar 2022 11:42:52 +0200] rev 150
 
    - extract polygon cache out of Model
 
    - Tue, 01 Mar 2022 17:00:19 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 01 Mar 2022 17:00:19 +0200] rev 149
 
    - work on edit history
 
    - Tue, 02 Nov 2021 15:43:57 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 02 Nov 2021 15:43:57 +0200] rev 148
 
    - reworking
 
    - Sun, 24 Oct 2021 11:33:32 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 24 Oct 2021 11:33:32 +0300] rev 147
 
    - update
 
    - Tue, 28 Sep 2021 23:09:09 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 28 Sep 2021 23:09:09 +0300] rev 146
 
    - remove outdated comment
 
    - Tue, 28 Sep 2021 23:07:23 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 28 Sep 2021 23:07:23 +0300] rev 145
 
    - Use QSaveFile to save the file more safely
 
    - Tue, 28 Sep 2021 22:17:52 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 28 Sep 2021 22:17:52 +0300] rev 144
 
    - Fix handling of "BFC INVERTNEXT" with multiple inner whitespaces