Windows size saving/restoring problem on Windows 10

I'm not sure if this is TiddlyDesktop or nwjs issue, but it started with v0.0.15 and still exists in v0.0.20.

Every time I close and open wiki file or main window its size grows by +16 pixels horizontally and +39 pixels vertically. Checked with every version form 0.0.15 to 0.0.20 by comparing values in "User Data\Default\Preferences", key: browser.app_window_placement (right and bottom values are increasing). I suspect these 16 and 39 pixels might be connected with border width and titlebar height in Windows 10.

Because of this problem I keep working on v0.0.13 for long time, but I need newer version to handle some css rules better than this old version can. Now I have a dilemma: keep window sizes or get correct css rendering.

Any hint how to deal with this?

Reproduce the issue on Windows 10 using versions 0.0.15 through 0.0.20, then inspect User Data\Default\Preferences and the browser.app_window_placement values after repeatedly opening and closing a wiki or the main window. Compare the window bounds with the reported 16-pixel horizontal and 39-pixel vertical growth; done means reopening no longer changes the saved size.