Duplicated menu item mnemonics

[westram]

Generally duplicates should be fixed everywhere.
Practically they always tend to re-appear.

Gtk-version

• activates all menu-item-mnemonics, motif just picked the first in that case (or maybe arb only installed the first?!).
• activates mnemonics for buttons (and other gui-elements?) in all windows (duplicate check only done in windows with menus)
  • duplicate-check should be enhanced (in trunk) to check these elements as well (runtime check is present ​here; should be in trunk as changes to callers should be done there)

​Code to detect duplicated mnemonics has been removed from gtk.

• if that code removed duplicates then it should be reactivated
  was merged back to gtk_only with [11928]
• gtk-version should avoid duplicates in some other way

As effect several mnemonics are hardly usable atm.

• Example: EDIT4/Block/UnalignBlockCenter (which is duplicated by 'LineBlock↔ColumnBlock')
  • motif: unalign center usable via : 'Alt-b' 'c'
  • gtk:
    • First use: 'Alt-b' 'c' 'Enter'
    • Further uses: 'Alt-b' 'c' 'c' 'Enter'

(see also #274)

[westram]

gtk-port is dead

[westram]

Ticket retargeted after milestone deleted