https://bugs.kde.org/show_bug.cgi?id=508415
Bug ID: 508415
Summary: Kwin input events interference with IME switching
Classification: Plasma
Product: kwin
Version First master
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: input
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Issue moved from: https://invent.kde.org/plasma/plasma-desktop/-/issues/151
## Problem description
So when I want to launch an app or search for a file, I usually hit meta to
kick off the app launcher, and then type my search conditions. This works well
for English searches, but not quite so for duo-lingual setups, where one
typically binds input method switching / keyboard mapping switching to
`meta+space` (modern windows), `ctrl+space` (legacy windows) or `alt+space`
(fruit computer) -- instead of switching the IME, the space key is intercepted
by the favourates entry and will trigger an application launch instead.
## Repro
Say I want to search for `测试文档.docx`.
Hit meta to reveal the launcher:
Notice that I'm on English keyboard, and I want to switch to Chinese:
{width=279
height=165}
So I hit `meta+space`, but instead of switching the IME, `firefox` is launched.
## Workaround
`KickoffGridDelegate` is the clickable item that treats space as button press
and intercepted the event.
So I directly patched the system file (ArchLinux):
```patch
--- a/KickoffGridDelegate.qml
+++ b/KickoffGridDelegate.qml
@@ -79,4 +79,11 @@ AbstractKickoffItemDelegate {
color: root.iconAndLabelsShouldlookSelected ?
Kirigami.Theme.highlightedTextColor : Kirigami.Theme.textColor
}
}
+
+ Keys.onPressed: event => {
+ if (event.key === Qt.Key_Space) {
+ event.accepted = true;
+ kickoff.searchField.forceActiveFocus(Qt.ShortcutFocusReason);
+ }
+ }
}
```
```bash
#!/bin/bash
sudo patch
/usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffListDelegate.qml
< ./kickoff-redirect-spacekey-to-search.patch
sudo patch
/usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffGridDelegate.qml
< ./kickoff-redirect-spacekey-to-search.patch
```
(Note, the list delegates also intercepts space and prevents IME switching, but
since it's a category menu, it doesn't launch anything)
However this breaks existing functionality of space activation, so I can't open
a PR with this solution.
Ideally, the launcher (or anything that redirects input to a text input) should
be aware of IME keyboard shortcut (fcitx5, ibus etc.), prevent default action
(space, enter, etc.) and pass the signal to the IME switcher.
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