vscode: Suggest widget does not resize properly when number of suggestions increases.

Issue Type: Bug

When there is a small number of suggestions a small suggest widget is shown. If later a larger number of suggestions is given then the box remains at the small size and it isn’t obvious that the rest of the suggestions gets cut off. The size seems to be based on the first box in a sequence of suggestions.

As an example here is a case using the codeql extension. Typing m. in the following ends up first suggesting m and then tries to suggest methods on Bar (foo, toString, getAQlClass) but with a small box which only shows foo (although you can get the rest by scrolling.

newtype TFoo = Foo()
select "test"
class Bar extends Foo { predicate foo() {any()} string toString() {any()}}

predicate foo(Bar m) {
  m.
}

I would expect to see the same size box as I get with Ctrl-Space the second time around.

It seems like all of the default providers always show many suggestions or never end up showing more suggestions so I couldn’t find a case to reproduce.

This seems to be a regression since 1.50.1 where a full sized suggestion widget was shown for the second set of suggestions

It seems to happen on macos and linux (windows not tested).

VS Code version: Code 1.51.1 (e5a624b788d92b8d34d1392e4c4d9789406efe8f, 2020-11-10T23:31:29.624Z) OS version: Linux x64 4.19.0-12-amd64

System Info

Item	Value
CPUs	Intel® Core™ i7-4810MQ CPU @ 2.80GHz (8 x 3219)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off opengl: enabled_on protected_video_decode: unavailable_off rasterization: disabled_software skia_renderer: enabled_on video_decode: unavailable_off vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	31.02GB (13.21GB free)
Process Argv	–no-sandbox --unity-launch --crash-reporter-id 66c77ce2-2dd6-4bac-9c9c-633de1e518e9
Screen Reader	no
VM	0%
DESKTOP_SESSION	gnome
XDG_CURRENT_DESKTOP	GNOME
XDG_SESSION_DESKTOP	gnome
XDG_SESSION_TYPE	wayland

Extensions (19)

Extension	Author (truncated)	Version
vscode-eslint	dba	2.1.13
gitlens	eam	11.0.1
tsfmt-vscode	ete	0.3.3
vscode-codeql	Git	1.3.6
vscode-test-explorer	hbe	2.19.3
vscode-graphviz	joa	0.0.6
csharp	ms-	1.23.6
python	ms-	2020.11.367453362
jupyter	ms-	2020.11.358541065
vscode-groovy-lint	Nic	1.3.0
java	red	0.71.0
rust	rus	0.7.8
vscode-lldb	vad	1.6.0
vscodeintellicode	Vis	1.2.10
vscode-java-debug	vsc	0.29.0
vscode-java-dependency	vsc	0.15.0
vscode-java-pack	vsc	0.10.0
vscode-java-test	vsc	0.26.0
vscode-maven	vsc	0.25.0