adding property maximized_vert toggles instead of adding

[Teemu Leisti]

Environment:

Command lsb_release -rd yields:
    Description: Ubuntu 22.04.1 LTS
    Release: 22.04

Note: using the Xubuntu distribution, with the Xfce window manager.

Command apt-cache policy wmctrl yields:

    wmctrl:
      Installed: 1.07-7build1
      Candidate: 1.07-7build1
      Version table:
     *** 1.07-7build1 500
            500 http://archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
            100 /var/lib/dpkg/status

Using version 0.8.10-1 of package xfce4-terminal.

How to reproduce the bug:

1. Open a terminal window, not maximized vertically.

2. Give the following command: wmctrl -r :ACTIVE: -b add,maximized_vert

3. Repeat the command in step 2.

Expected result: After step 2, the terminal window is maximized vertically. After step 3, there's no change to the size or position of the terminal window.

Observed result: After step 2, the terminal window is maximized vertically. After step 3, the terminal window returns to its previous size. This happens consistently: giving the command many times in a row in effect toggles the vertical maximization.

See image file bug.png, in which three screenshots are conflated.

Note 1: The same bug occurs even when the title of another window is substituted for :ACTIVE:.

Note 2: The same bug occurs occasionally when adding the maximized_horz property, but not consistently.