Expand Selection when using Multi Cursor only selects first line

[alan-cole]

• VSCode Version: Code 1.19.2 (490ef76, 2018-01-10T15:49:04.682Z)
• OS Version: Darwin x64 16.7.0
• Extensions:

Extension	Author (truncated)	Version
EditorConfig	Edi	0.11.1
beautify	Hoo	1.1.1
lorem-ipsum	Tyr	1.1.0
sort-lines	Tyr	1.4.1
Bookmarks	ale	0.18.0
vagrant	bbe	0.5.0
vscode-svgviewer	css	1.4.3
vscode-eslint	dba	1.4.4
php-debug	fel	1.12.1
php-intellisense	fel	2.2.5
file-icons	fil	1.0.7
sass-lint	gle	1.0.1
behatcomplete	har	0.1.0
php-symbols	lin	2.1.0
camelcasenavigation	map	0.3.42
VS-code-drupal	mar	0.0.12
twig-language	mbl	0.2.6
vscode-scss	mrm	0.6.2
sublime-keybindings	ms-	3.0.3
incrementor	nms	0.1.0
vetur	oct	0.11.6
px-to-rem	sai	1.2.3
trailing-spaces	sha	0.2.11
cucumber	ste	0.9.6
gitblame	wad	2.2.0

---

Steps to Reproduce:

1. New SCSS file with the following:

.class {
  font-size: 12px;
  padding: 24px 26px;
  border-left: 36px solid red;
}

2. Place a cursor in each CSS rule (font-size, padding, border-left).
3. Use the 'Expand Select' function.

Expected: All three rules are selected up until the colon.
Actual: Only the first rule is selected up to the colon.

Reproduces without extensions: Yes

[jrieken]

@aeschli @octref I have adopted JSON, CSS, HTML to the new proposed API which adds the notion of multiple positions per request.