Incorrect bullet location when wrapping long LaTeX equations

[danmou]

Current behavior

When long LaTeX equations in a bulleted list are wrapped accross multiple lines (with the new behavior introduced in #1718), the bullet is always aligned with the lowest line of the equation in the preview.

For example:

* Loss function (MAP with Gaussian prior -- L2 regularization)
  * $\min\limits_{\mathbf w} \displaystyle ∑\limits_{i = 1}^n \log \left(1 + \exp \left(-y_i \mathbf w^T \mathbf x_i\right)\right) + λ \| \mathbf w\|_2^2$

Results in the following preview (when the window is sufficiently small):

Expected behavior

The bullet should be on the line starting with min in the above example

Environment

• Version : 0.11.7
• OS Version and name : Ubuntu 16.04

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