Message window has zero height when reshown after restarting Geany

[xiota]

Geany built from git. GTK+ v3.24.30, GLib v2.68.4.

Steps to reproduce:

1. Maximize Geany.
2. Hide message window.
3. Close Geany.
4. Restart Geany.
5. Unmaximize Geany.
6. Reshow message window. Appears to fail because message window has zero height. Can be resized to former height.

Notes:

• Message window is at the bottom of the window. Have not tested, but probably not an issue if message window is at the top or sides.
• Potential solution: In the config file, The message window position is saved. Instead, the message window size should be saved, and the position calculated based on which side it's on.
• Potential solution: Calculating position is complicated by the visibility and size of various components. Saving the position for maximized and normal states separately would also prevent this problem.

[elextr]

Can't reproduce on:

08:39:58: Geany INFO		: Geany 1.38 (git >= cfc2b229), en_AU.UTF-8
08:39:58: Geany INFO		: GTK 3.24.20, GLib 2.64.6
08:39:58: Geany INFO		: OS: Linux Mint 20 (ulyana)

or

Geany INFO		: Geany 1.39 (git >= 56416311), en_AU.UTF-8

[elextr]

With Geany closed and using a non-geany editor post copies of the msgwindow_visible and msgwindow_position lines from Geany.conf for the following and also note if the problem occurs on re-opening:

1. Geany not maximised msgwin visible
2. Geany not maximised msgwin hidden
3. Geany maximised msgwin visible
4. Geany maximised msgwin hidden

Please post just the two lines, not 4 copies of the whole file.

[xiota]

1. Geany not maximised msgwin visible
   msgwindow_visible=true
   msgwindow_position=493
2. Geany not maximised msgwin hidden
   msgwindow_visible=false
   msgwindow_position=493
3. Geany maximised msgwin visible
   msgwindow_visible=true
   msgwindow_position=642
4. Geany maximised msgwin hidden
   msgwindow_visible=false
   msgwindow_position=642
5. Geany not maximised msgwin visible ­– after restart and toggle from maximized msgwin hidden
   msgwindow_visible=true
   msgwindow_position=642

[xiota]

Related: #576