Moving a window occasionally shrinks it while moving it.

This is unusual, as only the narrowest possible piece of the window is shown. Hope to get something better soon. I still cannot reproduce it on demand. It's the long gray bar about 60% of the way down from the top. It is in mid-move. Here I'm holding it there with the mouse.

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GOT IT!

OK, I can reproduce it now. You click and hold the title, then the window shrinks, you can move it around in its shrunken form, then release the mouse and the window expands back out, but in its new place. In the Finder here, you need to click and hold anywhere in the SORT_ORDER window. As soon as you start to move it, it ends up shrunk, as in the 2nd screenshot. Move it where you want, and then it is restored to regular size in the new place. Must be an ultra-secret mouse function. Is this documented somewhere? I couldn't find it.

I mean anywhere in the SORT_ORDER tab, that is, above the Date Modified box and below the control icons. Or just click and hold on the tab label SORT_ORDER, then drag it around.

Only happens on some apps, at least the Finder, Firefox, Safari, Mail. In Mail, open your Inbox, then click and hold Inbox, and move it around. As soon as you start to move it, it will shrink and become semi-transparent.

TIA!

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The screenshot is just to save me from typing all that stuff in. If I didn't include that, you and others would be asking for the macOS version, hardware model, etc., no?

If I manage to get a screenshot of it occurring, I will post it. But it's not easy to do! I have to press Shift-Cmd-5 while holding the mouse down, during which I can't adjust the screenshot frame! Wait, I can maybe drag it in, if the frame is big enough! Since it only happens once in a while, it's hard to be ready for it. Maybe I can set the thing to crop the full screen in advance. A quick test shows that it might work.

Evidently you've never seen it happen, or you wouldn't need a screenshot. It's quite dramatic. You couldn't help but notice it.

But I have to remember to have the frame set to the whole screen, because the event can happen at any time. I had to hold the mouse to keep the moving window shrunk, which means I have to take the screenshot with only my left hand. And it was you who suggested Cmd-Sh-3. Maybe it's just another minor bug among others.

It looks like I described. It's a shrunk-down window that I can more, and then when I let go of the mouse button, it expands back to normal size. Just imagine the image I did post, but with the moving window narrower and the full window, but shrunk, there instead.

That works for Cmd-sh-5. I looked in the folder I set there, and on the desktop for the screenshots, and came up empty. It doesn't work with Cmd-Sh-3. Only Cmd-Sh-5, which is the one I have to keep ready in full screen mode. Which I forgot to do that last time I got this moving window weirditie.

Then why does it also work on the Mail window? Click and hold Inbox at the center top, and drag it. It will shrink the same. Not a tab, AFAICT. BTW, at least for Inbox, you have to move the pointer up or down. It doesn't work if you move it left or right!

If it takes minutes, and repeated inspection of the same drop-down menus and sys-prefs and whatnot, it's secret. (I first wasted time hunting for them in the Cmd-, [i.e., command comma] aka Preferences on one of the menus.) Why aren't they all in the same place? So I have to check the menus, the app prefs., and the sys prefs. I assume any one of them is somewhere in there. That's a lot of places to look. Sometimes it could be a right-click menu. And where's the setting for Mail? I can't find that one at all.

When there's only one tab, it's a window. When you move a tab, it looks like a window. When you move a window that has only one tab, which is almost silly, it's a window. Aren't tabs just windows inside an enveloping window? Maybe I'm old-fashioned, but when I think of tabs, I also think of the part that sticks out on regular paper folders and such. You know, the part where you write with a pen or pencil what you put in that folder.

Is this action documented anywhere? It always came as a big surprise. And I don't think it was always tabs. Maybe it was. Or maybe it was the single tab in a single window trick.

And why would the inbox be a tab? Can you put multiple tabs/windows in that window? If so, it's news to me. And if you have multiple messages in a single window, won't each tab be labelled anyway?

I would have hoped you would have guessed tabs: "Are you sure you're not talking about tabs?"

A tab is a window in a window. And it becomes an isolated window when you're moving it. So I asked about windows. If I knew it was a tab, I would have said tab. To me it looked like I was moving a window. So I said window.

Thanks! Sounds good. Hopefully it will happen by the end of the week.

Where does Cmd-Sh-3 put the image file? I can't find it!!!