Reproduction steps:
1. Open attached project
2. Open and play the "TestScene" scene
3. Notice that the right Input Field has the same line count as the left one, although the right Input Field could fit more lines (check ScreenShot.png)

Actual result: The line count of the right Input Field is the same as the left one.

Expected result: Unity should fit more line if the Line Spacing is less than 1.

Note: Reproduces only when Horizontal Overflow is set to Wrap.

Regression introduced in: 5.3