bug#13059: frame-title does not update modified toggle on tmpfs

[Yi Wang]

Hello,

If I set frame-title as:

(setq frame-title-format "%b  %* ")

The modified mark * will display correctly for normal files. But for files in /tmp (where tmpfs is enabled), the modified mark almost never appears (though actually buffer is modified).

On the other hand, the modified mark on the mode-line always displays correctly.

Perhaps this is a bug?

Best wishes,

Yi