Better XIM interaction by filtering modifiers

[amosbird]

After diagnosing both the server and client sides of xcb-imdkit, specifically rofi and fcitx5, it has been determined that modifiers are causing the slowdown. This is a follow-up to PR #1999.

A new dependency, xcb-keysyms, has been added to properly recognize modifier keys.

I only performed some basic tests based on my daily workflow, and it worked smoothly. Let's see if this fix can stand the test of time.

[xsy420]

I have tried this pull and #1999
before these two commits, fcitx5 can show and change input method by using

meson setup --reconfigure -Dimdkit=true --prefix=~/.local/ build
ninja -C build

but since #1999, these two commands can't build a rofi that support fcitx5 showing
I have also tried building command in archlinux-rofi
I have xcb-imdkit and xcb-keysyms installed
what am I missing? and what's your building command to build a rofi that makes fcitx5 work perfectly?

[DaveDavenport]

Do you have any errors it reports? 'it does not build' gives me very little to go on.

For me latest git (that includes these patches) builds fine.

[xsy420]

building process goes fine but after I run rofi -show drun and press my fcitx5 input method changing key-binding fcitx5 doesn't show. before these two commits, it can.
meson.log
ninja.log

[DaveDavenport]

aah, I thought it did not build with imdkit enabled. I know to little about this to help, @amosbird do you know?

[amosbird]

@xsy420 What key binding do you use to toggle the input method?

[xsy420]

when I downgrade xcb-imdkit to 1.0.2
meson.log
left shift key to toggle

[xsy420]

so it is key-binding conflict?

[amosbird]

Modifier-alone key bindings won't work after this PR. However, there should be a way to improve this by allowing such events to pass through. I will look into this further.

[xsy420]

maybe try to read [HotKey/TriggerKeys] value in $XDG_CONFIG_DIR/fcitx5/config?