Latch without set

[wismill]

Latch modifiers are sometime used as built-in dead keys, so that:

• they do not rely on the installation of custom Compose file;
• they do not clash with other layouts.

However, layout projects usually want the exact same behavior on all OS, but the XKB latch behavior (often misunderstood) also acts as a set modifier, which is not the behavior of other OS.

We could propose a Latch* action option to disable the set behavior, e.g. noSet. This option could also be extended to the Lock* actions.

Note: #611 would be useful to fix too with a new option.

EDIT: See #800 for a fix.

@mahkoh @Jules-Bertholet

[Jules-Bertholet]

However, layout projects usually want the exact same behavior on all OS, but the XKB latch behavior (often misunderstood) also acts as a set modifier, which is not the behavior of other OS.

I’m sorry, I don’t understand what this means.

[wismill]

I simply means that LatchMods keeps the modifier activated while pressed, which is not what usual dead keys do. E.g. if one creates a layout for Windows with dead keys, they will not act the same on Linux if using LatchMods().

Some people expect the latch effect to trigger immediately at press then to stop once a key that breaks the latch is pressed.

[wismill]

Key press and release events have the same effect as for SA_SetMods

Source

I propose to offer an option to avoid that. Exact behavior to be defined in this discussion.

[Jules-Bertholet]

which is not what usual dead keys do.

It seems that they do, at least with Ibus. Try holding down dead_acute and A at the same time, you get “áááááááááááááááááááááááááááááááááááááááááááá”

[wismill]

They do not with Qt and Gtk implementations (without IBus).

[wismill]

Done in #800.