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menu: implement menu accelerators

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Menu accelerators are one-letter mnemonics to quickly select/exec
items from the current menu. For each menu item, the accelerator is
defined as the first character of the item label, converted to
lowercase. A different accelerator can be explicitly defined in
menu.xml with the special '_' character before the target letter.

- Add a field `accelerator` to the `menuitem` struct
- Implement `menu_item_select_by_accelerator()`

Example:
The accelerator for an item with the label "e_macs" is 'm'.
This commit is contained in:
Alex Chernika 2026-04-10 14:52:24 +02:00 • committed by Johan Malm
parent 07a0a4e59b
commit 3632c6703a
4 changed files with 190 additions and 8 deletions
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15
docs/labwc-menu.5.scd
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@ -148,6 +148,21 @@ obmenu-generator with the menu generator of your choice):
</openbox_menu>
```
# ACCELERATORS / MNEMONICS
Menu accelerators are one-letter mnemonics to quickly select/exec items from
the current menu. For each menu item, the accelerator is defined as the first
character of the item label, converted to lowercase. A different accelerator
can be explicitly defined in menu.xml with the special '\_' character before the
target letter. Accelerators can be any unicode character and are not limited to
ASCII. A usual underscore can be shown by duplicating it.
If the menu only contains a single instance of the pressed accelerator the item
will be executed directly. Otherwise, all matching items are cycled through.
Example:
The accelerator for an item with the label "e_Macs" is 'm'.
# LOCALISATION
Available localisation for the default "client-menu" is only shown if no