Exotic keyboard layout results in incorrect characters input

[Olivier Tilloy]

My default keyboard layout is Bépo (a French variant of dvorak).
When running autopilot tests with this keyboard layout, some characters are messed up when being input in a text field: dot (".") is incorrectly replaced by semi-colon (":"). Note that with this keyboard layout, semi-colon is obtained by pressing shift+dot.
If I use `gnome-control-center region` to set the default keyboard layout to US-qwerty, I can’t observe the issue.

Not sure if this has anything to do with the use of xmodmap, here is the output of xmodmap on my machine just in case:

osomon@granuja:~$ xmodmap
xmodmap: up to 4 keys per modifier, (keycodes in parentheses):

shift Shift_L (0x32), Shift_R (0x3e)
lock Caps_Lock (0x42)
control Control_L (0x25), Control_R (0x69)
mod1 Alt_L (0x40), Meta_L (0xcd)
mod2 Num_Lock (0x4d)
mod3
mod4 Super_L (0x85), Super_R (0x86), Super_L (0xce), Hyper_L (0xcf)
mod5 ISO_Level3_Shift (0x5c), Mode_switch (0xcb)

Note that when autopilot tests are being run, the debug output claims that it’s sending the key event for ".", but instead ":" is input:

10:49:04.102 DEBUG X11:214 - Sending press event for key: .
10:49:04.205 DEBUG X11:217 - Sending release event for key: .

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel Kessel (dkessel)]

This is also an issue with a standard German keyboard layout