Bug#912335: gnome-terminal: minor redraw issue when moving a window over the terminal

[Vincent Lefevre]

On 2018-10-30 16:13:48 +0100, Egmont Koblinger wrote:
> Just for the record, the test file is the same as in bug 912329, correct?

Yes:

Box drawing alignment tests:                                          █
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  ║┌─╨─┐║  │╔═╧═╗│  │╒═╪═╕│  │╓─╁─╖│  ┃┌─╂─┐┃  ┗╃╄┙  ╶┼╴╺╋╸┠┼┨ ┝╋┥    ▋ ╲╱╲╱╳╳╳
  ║│╲ ╱│║  │║   ║│  ││ │ ││  │║ ┃ ║│  ┃│ ╿ │┃  ┍╅╆┓   ╵  ╹ ┗┷┛ └┸┘    ▌ ╱╲╱╲╳╳╳
  ╠╡ ╳ ╞╣  ├╢   ╟┤  ├┼─┼─┼┤  ├╫─╂─╫┤  ┣┿╾┼╼┿┫  ┕┛┖┚     ┌┄┄┐ ╎ ┏┅┅┓ ┋ ▍ ╲╱╲╱╳╳╳
  ║│╱ ╲│║  │║   ║│  ││ │ ││  │║ ┃ ║│  ┃│ ╽ │┃  ░░▒▒▓▓██ ┊  ┆ ╎ ╏  ┇ ┋ ▎
  ║└─╥─┘║  │╚═╤═╝│  │╘═╪═╛│  │╙─╀─╜│  ┃└─╂─┘┃  ░░▒▒▓▓██ ┊  ┆ ╎ ╏  ┇ ┋ ▏
  ╚══╩══╝  └──┴──┘  ╰──┴──╯  ╰──┴──╯  ┗━━┻━━┛  ▗▄▖▛▀▜   └╌╌┘ ╎ ┗╍╍┛ ┋  ▁▂▃▄▅▆▇█
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> In which direction do you move the other window? (I tried multiple
> possibilities.)

I can reproduce the issue when moving the window from left to right
and also from right to left. No issues when moving the window from
top to bottom or from bottom to top.

It is better to move the window slowly: more chance to get vertival
lines, and there are more such lines.

If I disable "Custom font", I cannot reproduce the issue, but this
is probably related to my following remark:

I get it with Liberation Mono Regular 13, but not with size 12.
I think that the oblique characters need to be bold enough to
reproduce the issue.

Actually, these oblique characters do not seem to be related to
the font (handled by VTE like the box ones?), just to the size.

I've just tried on another machine, which uses nouveau instead of
the nvidia driver, and I cannot reproduce the issue.

> If you feel like, could you help trying out vte 0.54.2 and git master,
> compile the standard way (./autogen.sh or ./configure; make) and then run
> ./src/app/vte-2.91 ?

I'll try if I have some time.

-- 
Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)