CSS Timing Function Quick Edit: linear is invalid syntax

[petetnt]

Steps to reproduce:

• Create a .css file

.test {
  animation-timing-function: linear;
}

• Place cursor on linear and press CTRL+E, which results in CSS Timing Function Quick Edit: invalid syntax.

Expected: Timing Function Quick Edit (Bezier curve editor?) view opens up with a line representing cubic-bezier(0.0, 0.0, 1.0, 1.0) (ref MDN).

Windows 8.1, Release 1.4 development build 1.4.0-0 (master 9264e29)

[petetnt]

This line states that:

// The linear keyword can occur in other values, so for strict parsing we
// only detect when it's on same line as "transition"

Checking for "animation" together with transition fixes the problem.

   LINEAR_STRICT_REGEX             = /transition|animation.*?[: ,]linear[ ,;]/,

I've got a PR ready that's ok