XSetWMNormalHints

I recently upgraded from Debian 10 to Debian 11.

My gvim used to always do resize increments by character.  Dragging a window edge would resize the window by snapping to the nearest whole character.  I would even see the window size written on screen, as characters, not pixels.  Now I see sizes by pixels.  My xterm windows still resize by character, as before.

I use fvwm on my host, but I also tried this on a PopOS VM, for whatever the default WM is for that.  The Windows 10 VM does still resize on characters.

For what I have read, this is part of ICCCM, specifically setting PResizeSize with XSetWMNormalHints().  The only thing I saw in the vim source is

#define XSetWMNormalHints XSETWMNORMALHINTS

I'm not sure where that is even used.

I've been digging around for a few hours now and was hoping someone could give me hint where to look next.

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