Click anywhere on empty pad won't open device keyboard

[ramonlsouza]

Describe the bug
When you have a pad with empty text on mobile devices, you need to click in the blinking cursor to open the device keyboard.

The same does not happen if you already have some text (or in older versions of Etherpad).

To Reproduce
Steps to reproduce the behavior:

1. Go to http://demo.etherpad.com/ (on a mobile device)
2. Create new pad
3. Erase all default text
4. Close device keyboard
5. Click anywhere on the screen except the blinking cursor
6. Device keyboard won't open

Expected behavior
Device keyboard should open by clicking anywhere on step 6.

Server (please complete the following information):

• Etherpad version: 1.8.7 (also happens in https://demo.etherpad.com/)
• OS: Ubuntu 18.04
• Node.js version (node --version): v12.21.0
• npm version (npm --version): 6.14.11

Smartphone (please complete the following information):

• Device: Samsung Galaxy S10e
• OS: Android 11
• Browser: Google Chrome
• Version: 89.0.4389.72

Additional context
We have an older test server running Etherpad 1.8.0 and the behavior is as expected (https://etherpad.wikimedia.org/ also works as expected)

[webzwo0i]

Thanks for reporting. Bisect says 98de2b0

[JohnMcLear]

Wow good job @webzwo0i that's a decent bisect and super interesting

[rhansen]

@ramonlsouza Can you try copying this line to #innerdocbody:

etherpad-lite/src/static/css/iframe_editor.css

Line 14 in 4044860

min-height: 100vh; /* take at least full height */

[ramonlsouza]

@ramonlsouza Can you try copying this line to #innerdocbody:

etherpad-lite/src/static/css/iframe_editor.css

Line 14 in 4044860

min-height: 100vh; /* take at least full height */

It worked, thanks!