xfwm appears to ignore changes to WM_NORMAL_HINTS after mapping

[Olivier Fourdan]

Hi

Best way to investigate such issue is to provide a simple reproducer in C.

Cheers,
Olivier


On 23 August 2015 at 17:48, Sam Varshavchik <mrsam at courier-mta.com> wrote:

> Currently I have an application window that, according to xprop(1), has
> the following properties:
>
> WM_NORMAL_HINTS(WM_SIZE_HINTS):
>        program specified minimum size: 89 by 277
>        program specified maximum size: 1912 by 277
>
> So, the application window claims that its horizontal size can be
> adjusted, and its vertical size is fixed. So I should be able to resize
> this application window horizontally.
> If I prepare to grab either the left or the right border with the pointer,
> immediately upon hovering over the border xfwm (4.12) changes the mouse
> icon to an arrow in the appropriate direction, supposedly indicating that
> the application window can, indeed, be resized.
>
> However, as soon as I actually grab the appropriate border, the mouse icon
> changes to a hand, and instead of resizing the application window, xfwm4
> drags the entire window, changing its position, but keeping its existing
> size the same.
>
> It appears to me that xfwm4 reads WM_NORMAL_HINTS only when the
> application window gets mapped. At the time this application window got
> mapped, its WM_NORMAL_HINTS indicated a fixed size, with minimum and
> maximum width being the same (about the middle of this range). But after
> the window got mapped, my application updated its WM_NORMAL_HINTS to the
> values shown above.
>
> If I change the application to indicate an adjustable horizontal range
> before the window gets mapped, xfwm4 will let me resize the application
> window normally.
>
> I have not done enough experimentation to determine whether or not xfwm
> pays attention to updated WM_NORMAL_HINTS, as long as the initial values,
> when mapped, indicate an adjustable size (meaning that this occurs only if
> the initial WM_NORMAL_HINTS, upon mapping, reported a fixed size).
>
> Does this look like a bug, or am I failing to implement some parts of
> icccm that prod the WM to look at WM_NORMAL_HINTS again?
>
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