keys on keyboard bar with meta / alt modifier not working

[helguson]

• Device: FP2
• UT channel: 16.04 rc
• UT build: 2018-W29
• terminal-app version: 0.9.0

Background

Using the last version of ubuntu touch by canonical I created and used some custom keyboard bar layouts. Recently I transferred those layouts to ubuntu touch by ubports and noticed that my keys with meta or alt modifier are not received anymore.

Steps to reproduce

For demonstration we will use the preinstalled showkey that will print the codes for pressed keys as well as a test layout.

Setup

1. create user layout directory if it does not already exist
   mkdir -p ~/.config/ubuntu-terminal-app/Layouts
2. copy test layout to layout directory
   cp 'test layout.txt' '~/.config/ubuntu-terminal-app/Layouts/test layout.json'

Procedure

1. (re)start terminal-app and enter passcode
2. choose test layout for the keyboard bar
3. run sudo showkey -a
4. press x on the on-screen keyboard
5. press x on the keyboard bar
6. press C-x on the keyboard bar for CTRL+X
7. press M-x on the keyboard bar for ALT+X
8. press C-d on the keyboard bar for CTRL+D

Expected behavior

on 4. showkey creates output for the key that was pressed
on 5. showkey creates output for the key that was pressed
on 6. showkey creates output for the key that was pressed
on 7. showkey creates output for the key that was pressed
on 8. showkey creates output for the key that was pressed and stops

So the output should look similar to this what I created using a bluetooth keyboard:

Actual behavior

on 4. showkey creates output for the key that was pressed
on 5. nothing happens
on 6. showkey creates output for the key that was pressed
on 7. nothing happens
on 8. showkey creates output for the key that was pressed and stops

So actually I get the following output:

Additional information and logs

log_terminal-app.txt

[myii]

@helguson I can confirm this behaviour. I've found one exception, though. Alt + any of the arrow keys. I.e.

        {                                                                       
            "main_action" : {                                                   
                "type": "key",                                                  
                "text": "M-\u2191",                                             
                "key" : "Up",                                                   
                "mod" : "Alt"                                                   
            }                                                                   
        },                                                                      
        {                                                                       
            "main_action" : {                                                   
                "type": "key",                                                  
                "text": "M-\u2193",                                             
                "key" : "Down",                                                 
                "mod" : "Alt"                                                   
            }                                                                   
        },                                                                      
        {                                                                       
            "main_action" : {                                                   
                "type": "key",                                                  
                "text": "M-\u2190",                                             
                "key" : "Left",                                                 
                "mod" : "Alt"                                                   
            }                                                                   
        },                                                                      
        {                                                                       
            "main_action" : {                                                   
                "type": "key",                                                  
                "text": "M-\u2192",                                             
                "key" : "Right",                                                
                "mod" : "Alt"                                                   
            }                                                                   
        },

Also tried with PageUp and PageDown but faced the same problem.

• Device: N5
• UT channel: 16.04 devel
• UT build: 2019-01-08
• terminal-app version: 0.9.0