Mouse line selection should not stop at terminal border

[bew]

Describe the bug

If I print a long line, longer than the width of the terminal, doing a line selection (triple mouse click with default config) stops at the terminal border, instead of selecting the entire logical line (everything until \n)

Environment (please complete the following information):

• OS: Linux X11
• Version: 20210203-095643-70a364eb-8-gaa75dda1

To Reproduce

1. Run wezterm -n
2. Then input echo {1..100} to print a long line of text.

+-----------------+
| $ echo {1..10}  |
| 1 2 3 4 5 6 7 8 |
|  9 10           |
|                 |
|                 |
|                 |
+-----------------+

3. Triple click on the line

We see the following selection (between [ & ])

+-----------------+
| $ echo {1..10}  |
|[1 2 3 4 5 6 7 8]|
|  9 10           |
|                 |
|                 |
|                 |
+-----------------+

Expected behavior

+-----------------+
| $ echo {1..10}  |
|[1 2 3 4 5 6 7 8 |
|  9 10          ]|
|                 |
|                 |
|                 |
+-----------------+

[github-actions]

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