Fix an issue where xkb defined hotkeys for arrows would not work (#34823)

Sergei Surovtsev and Conrad Irwin created 4 months ago

Addresses
https://github.com/zed-industries/zed/pull/34053#issuecomment-3096447601
where custom-defined arrows would stop working in Zed.

How to reproduce:

1. Define custom keyboard layout

```bash
cd /usr/share/X11/xkb/symbols/
sudo nano mykbd
```

```
default partial alphanumeric_keys
xkb_symbols "custom" {

    name[Group1]= "Custom Layout";

    key <AD01> { [ q,  Q,  Escape,     Escape      ] };
    key <AD02> { [ w,  W,  Home,       Home        ] };
    key <AD03> { [ e,  E,  Up,         Up          ] };
    key <AD04> { [ r,  R,  End,        End         ] };
    key <AD05> { [ t,  T,  Tab,        Tab         ] };

    key <AC01> { [ a,  A,  Return,     Return      ] };
    key <AC02> { [ s,  S,  Left,       Left        ] };
    key <AC03> { [ d,  D,  Down,       Down        ] };
    key <AC04> { [ f,  F,  Right,      Right       ] };
    key <AC05> { [ g,  G,  BackSpace,  BackSpace   ] };

    // include a base layout to inherit the rest
    include "us(basic)"
};
```

2. Activate custom layout with win-key as AltGr

```bash
setxkbmap mykbd -variant custom -option lv3:win_switch
```

3. Now Win-S should produce left arrow, Win-F right arrow
4. Test whether it works in Zed

Release Notes:

 - linux: xkb-defined hotkeys for arrow keys should behave as expected.

---------

Co-authored-by: Conrad Irwin <[e-mail]>

Change summary

crates/gpui/src/platform/linux/platform.rs | 7 +++++++
1 file changed, 7 insertions(+)

Detailed changes

crates/gpui/src/platform/linux/platform.rs

@@ -828,6 +828,13 @@ impl crate::Keystroke {
             Keysym::Delete => "delete".to_owned(),
             Keysym::Escape => "escape".to_owned(),
 
+            Keysym::Left => "left".to_owned(),
+            Keysym::Right => "right".to_owned(),
+            Keysym::Up => "up".to_owned(),
+            Keysym::Down => "down".to_owned(),
+            Keysym::Home => "home".to_owned(),
+            Keysym::End => "end".to_owned(),
+
             _ => {
                 let name = xkb::keysym_get_name(key_sym).to_lowercase();
                 if key_sym.is_keypad_key() {