Verification builds:
1.6.0.8 | Android: Yes
1.5.2.1 | Android: Yes
1.5.2.1 | Windows 10: No
1.6.0.8 | Windows 10: No
1.5.2.1 | Xbox One: No

Summary:
Players using a keyboard or controller can gain altitude when gliding with elytra in creative by pressing the jump button. This feature does not work for players using touch controls.

Steps to Reproduce:

1. Enter a creative world
2. Equip a pair of elytra
3. Jump off a platform and tap jump to activate the elytra
4. Press and hold jump again

Observed Results:
Pressing jump again does not cause the player to gain altitude when using touch controls.

Expected Results:
The player should be able to fly higher by pressing jump when gliding with elytra in creative, just as they can when using a keyboard or controller on other platforms.

Screenshots/Videos attached: Yes (expected behaviour on W10)

Notes: