Bug: min width & height of gtk window

[WHK Yan <yan.uniko.102@xxxxxxxxx>]

When editing a document and closing a window, sometimes when starting the software it does so with very small dimensions, like 1px x 1px, resizing a window that size is very difficult. It does not always maintain the size ratio of the last time it was closed. In any case, it should not allow resizing a window up to 1px wide, it should have a limit such as 300px x 200px.