Remove KDE 5 lock screen shake

Overview

When the password is wrong on the KDE 5 lock screen, the input field shakes left and right.

Solutions

Adjust animation speed

• Set animation speed to Instant
• Pros: simplest
• Cons: disables other animations

Modify the system theme

• Apply only the remove animation change to org.breeze.desktop
• Pros: simple
• Cons: changes global settings

Create a user theme

• Pros: does not change global settings
• Cons: complex and requires copying many directories

Fix

Copy the original theme

$ mkdir -p ~/.local/share/plasma/look-and-feel/
$ cd ~/.local/share/plasma/look-and-feel/

$ cp -R /usr/share/plasma/look-and-feel/org.kde.breeze.desktop/ ./org.scarf.breeze.desktop
$ cp -R /usr/share/plasma/look-and-feel/org.kde.breezetwilight.desktop/ ./org.scarf.breezetwilight.desktop

Remove animation from theme

$ rm -r scarf.breeze.desktop/contents/animation
$ rm -r scarf.breezetwilight.desktop/contents/animation

diff --git a/org.scarf.breeze.desktop/contents/lockscreen/LockScreenUi.qml b/org.scarf.breeze.desktop/contents/lockscreen/LockScreenUi.qml
index c39cdb6..c23a95b 100644
--- a/org.scarf.breeze.desktop/contents/lockscreen/LockScreenUi.qml
+++ b/org.scarf.breeze.desktop/contents/lockscreen/LockScreenUi.qml
@@ -16,7 +16,6 @@ import org.kde.plasma.workspace.components 2.0 as PW
 
 import org.kde.plasma.private.sessions 2.0
 import "../components"
-import "../components/animation"
 
 PlasmaCore.ColorScope {
 
@@ -37,7 +36,6 @@ PlasmaCore.ColorScope {
             root.notification += i18nd("plasma_lookandfeel_org.kde.lookandfeel","Unlocking failed");
             graceLockTimer.restart();
             notificationRemoveTimer.restart();
-            rejectPasswordAnimation.start();
             lockScreenUi.hadPrompt = false;
         }
 
@@ -108,11 +106,6 @@ PlasmaCore.ColorScope {
         visible: false
     }
 
-    RejectPasswordAnimation {
-        id: rejectPasswordAnimation
-        target: mainBlock
-    }
-
     MouseArea {
         id: lockScreenRoot

Copy contents/lockscreen to breezetwilight

$ cp -R org.scarf.breeze.desktop/contents/lockscreen/ org.scarf.breezetwilight.desktop/contents/lockscreen/
$ cp -R org.scarf.breeze.desktop/contents/components/ org.scarf.breezetwilight.desktop/contents/components/
$ cp -R org.scarf.breeze.desktop/contents/osd/ org.scarf.breezetwilight.desktop/contents/osd/

• It seems contents/defaults cannot point to another theme's lockscreen

Update QML version

diff --git a/32c6e6e b/61f84b6
index 32c6e6e..61f84b6 100644
--- a/32c6e6e
+++ b/61f84b6
@@ -141,5 +141,6 @@
         "Version": "2.0",
         "Website": "https://www.kde.org"
     },
+    "X-Plasma-APIVersion": "2",
     "X-Plasma-MainScript": "defaults"
 }

• https://old.reddit.com/r/kde/comments/ylp820/how_to_debug_lock_screen_theme_qml/
• https://invent.kde.org/plasma/kscreenlocker/-/merge_requests/59

Apply

Confirm the theme is installed

$ lookandfeeltool --list
org.scarf.breeze.desktop
org.scarf.breezetwilight.desktop
org.kde.breeze.desktop
org.kde.breezedark.desktop
org.kde.breezetwilight.desktop
org.kubuntu.desktop

Test

$ /usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet --testing --theme=org.scarf.breezetwilight.desktop

Use

$ lookandfeeltool --apply org.scarf.breezetwilight.desktop

References

• https://github.com/scarf005/breeze-static-lockscreen