Messages Widget cannot be resized

[jwrober]

Describe the bug
In master, the way we have the messages widget to be shown/hidden with a button on the top bar. Right now you can make it thinner by dragging from the right side of the screen, but you cannot make it wider by dragging from the left side. You can also not make it taller by dragging from the bottom. Its fixed location in the top right corner is fine, but would like to see it able to be enlarged or shrunk.

To Reproduce
Steps to reproduce the behavior:

1. Click on Messages button in right of the top bar to show the messages widget
2. Click on the right side and drag to make it smaller
3. Try to click on the left to drag, notice you cannot
4. Try to click on the bottom to drag, notice you cannot

Expected behavior
Keep the widget locked to the upper right of the game window.
Remove the ability to drag from the right, keep it pinned to right most edge of the screen/window
Add the ability to drag from the left (make it wider)
Add the ability to drag from the bottom (make it taller)

Screenshots
N/A

Platform and version (please complete the following information):

• OS: All
• Freeciv21 version: master at 7a9a40c
• Ruleset/Longturn game (if applicable): N/A

Additional context
None

[jwrober]

Closed via PR #1081