No vertical scrollbar appears the 1st time completion resolve occurs

[sean-mcmanus]

• VSCode Version: 1.33.1
• OS Version: Windows

Steps to Reproduce:

1. Install the C/C++ extension. It's not a C/C++ extension bug,
   but it doesn't repro with TypeScript.
2. Use the code below in a .cpp file, and use Ctrl+Space to invoke completion after "test1".
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   // lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
   int test1;
   test1

Bug: No vertical scroll bar appears so the text isn't viewable.
The vertical scrollbar re-appears the 2nd time completion occurs,
but the bug starts reproing again after a Reload Window.

This is the expected result:

Does this issue occur when all extensions are disabled?: Yes

[arussellk]

I was able to reproduce this in a .ts file by changing the comment style to /**.

I'd like to try fixing this bug and would appreciate any tips of where to look in the codebase. I found the issue in src/vs/editor/contrib/suggest/suggestWidget.ts:970.

VSCode version: 1.33.1
OS version: macOS Mojave 10.14.4
Extensions: none

/** lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 * lots of text lots of text lots of text lots of text lots of text lots of text lots of text lots of text
 */
let test1;
test1

Note: the scrollbar does appear for me (unlike the original bug report) but the content appears to be truncated the first time I press Ctrl+Space.