Splitted terminal resize display error

[clementNieto]

Issue Type: Bug

When you use the mouse to resize one of the splitted terminal part, the text do not move, the previouse display is'nt erased and the new display overwrite
the previous without cleared it.

In simple words, the two splitted terminal's display fuse when resized

VS Code version: Code 1.35.1 (c7d83e5, 2019-06-12T14:27:31.086Z)
OS version: Linux x64 4.18.0-25-generic

System Info

Item	Value
CPUs	AMD Ryzen 5 2400G with Radeon Vega Graphics (8 x 2037)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: disabled_software surface_synchronization: enabled_on video_decode: unavailable_off webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	13.71GB (4.18GB free)
Process Argv	--unity-launch
Screen Reader	no
VM	0%

Extensions (1)

Extension	Author (truncated)	Version
python	ms-	2019.6.24221

[clementNieto]

[clementNieto]

[clementNieto]

They are pottentially two things to adjust:

The first one is the fact that some newline ('\n') pop when you resized the splitted terminal.
The second one must be an error with the framerate.

For exemple, when you use 'clear', sometimes some line persist on the terminal

.
(On the right side of the screen shot)

[clementNieto]

Also, they are some errors when you use some unicode characters:
In this exemple, I didn't press the spacebar, and this bug exist only on vscode and is not on my default terminal. The caracter was obtained using (ctrl+Maj+u , 2795 , enter)

[Tyriar]

Closing as designed, when you resize the terminal and it goes into the prompt the shell redraws the shell over multiple lines, resizing back doesn't clear out the old wrapped lines and move the cursor up though. This happens in other terminals too.

Most unicode issues are due to xtermjs/xterm.js#1709