Terminal does not auto scroll after clearing output

[fdk17]

Issue Type: Bug

Create a build task where "presentation" "clear" is set to "true" .

Normally this works fine and the terminal is cleared and the terminal auto scrolls with the build output.

But when scrolling to the top of the output and then rerunning the task the output does not scroll. Only the few first lines of output is shown, you need to manually scroll to the bottom.

VS Code version: Code 1.33.1 (51b0b28, 2019-04-11T08:20:22.771Z)
OS version: Linux x64 4.4.0-144-generic

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (8 x 3500)
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)	7.68GB (1.17GB free)
Process Argv	--unity-launch
Screen Reader	no
VM	0%

Extensions (9)

Extension	Author (truncated)	Version
language-x86-64-assembly	13x	2.2.11
Bookmarks	ale	10.4.3
beautify	Hoo	1.4.11
shortcut-menu-bar	jer	0.1.5
cpptools	ms-	0.22.1
code-settings-sync	Sha	3.2.8
code-eol	soh	0.3.3
code-spell-checker	str	1.6.10
linkerscript	Zix	1.0.0

[Tyriar]

@alexr00 this is by design on the terminal side.

[alexr00]

To verify, open the hello world sample and add this task:

        {
            "type": "npm",
            "script": "compile",
            "group": "build",
            "problemMatcher": [],
            "presentation": {
                "clear": true
            }
        }

Create a lot of errors in the extension code.
Run the task.
Scroll to the top of the task terminal when the task is done.
Run the same task again, and verify that the terminal scrolls with the task output.