When the partition is full, attempting to save a file in Geany results in a complete file loss.
Geany version : 1.36 System : Ubuntu Linux 20.04 LTS
To reproduce :
1. Fill some partition until there is no space left on it. For example : fallocate -l 100G bigfile
2. Edit a text file located in the full partition and add some character to it
3. Try to save the file. Geany says there is no space left on device and gives some actions to try. Cancel and exit Geany
4. The edited file size is now 0KB and the data in it are completely lost