Add fcitx5

modules/user/modules/fcitx5/classicui.conf

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+# Vertical Candidate List
+Vertical Candidate List=False
+# Use Per Screen DPI
+PerScreenDPI=True
+# Use mouse wheel to go to prev or next page
+WheelForPaging=True
+# Font
+Font="Sans 10"
+# Menu Font
+MenuFont="Sans 10"
+# Tray Font
+TrayFont="Sans Bold 10"
+# Tray Label Outline Color
+TrayOutlineColor=#000000
+# Tray Label Text Color
+TrayTextColor=#ffffff
+# Prefer Text Icon
+PreferTextIcon=False
+# Show Layout Name In Icon
+ShowLayoutNameInIcon=True
+# Use input method language to display text
+UseInputMethodLangaugeToDisplayText=True
+# Theme
+Theme=plasma
+# Force font DPI on Wayland
+ForceWaylandDPI=0
+

modules/user/modules/fcitx5/config

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+[Hotkey]
+# Enumerate when press trigger key repeatedly
+EnumerateWithTriggerKeys=False
+# Enumerate Input Method Forward
+EnumerateForwardKeys=
+# Enumerate Input Method Backward
+EnumerateBackwardKeys=
+# Skip first input method while enumerating
+EnumerateSkipFirst=False
+# Enumerate Input Method Group Forward
+EnumerateGroupForwardKeys=
+# Enumerate Input Method Group Backward
+EnumerateGroupBackwardKeys=
+# Activate Input Method
+ActivateKeys=
+# Deactivate Input Method
+DeactivateKeys=
+# Default Previous page
+PrevPage=
+# Default Next page
+NextPage=
+# Default Previous Candidate
+PrevCandidate=
+# Default Next Candidate
+NextCandidate=
+# Toggle embedded preedit
+TogglePreedit=
+
+[Hotkey/TriggerKeys]
+0=Control+grave
+
+[Hotkey/AltTriggerKeys]
+0=Shift_L
+
+[Behavior]
+# Active By Default
+ActiveByDefault=False
+# Share Input State
+ShareInputState=No
+# Show preedit in application
+PreeditEnabledByDefault=True
+# Show Input Method Information when switch input method
+ShowInputMethodInformation=True
+# Show Input Method Information when changing focus
+showInputMethodInformationWhenFocusIn=False
+# Show compact input method information
+CompactInputMethodInformation=True
+# Show first input method information
+ShowFirstInputMethodInformation=True
+# Default page size
+DefaultPageSize=5
+# Override Xkb Option
+OverrideXkbOption=False
+# Custom Xkb Option
+CustomXkbOption=
+# Force Enabled Addons
+EnabledAddons=
+# Force Disabled Addons
+DisabledAddons=
+# Preload input method to be used by default
+PreloadInputMethod=True
+

modules/user/modules/fcitx5/default.nix

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+{ pkgs, ... }: {
+  i18n.inputMethod = {
+    enabled = "fcitx5";
+    fcitx5.addons = with pkgs; [
+      fcitx5-mozc
+      fcitx5-gtk
+      libsForQt5.fcitx5-qt
+    ];
+  };
+
+  xdg.configFile = {
+    "fcitx5/config".source = ./config;
+    "fcitx5/profile".source = ./profile;
+    "fcitx5/conf/classicui.conf".source = ./classicui.conf;
+    "mozc/config1.db".source = ./mozc-config1.db;
+  };
+}

modules/user/modules/fcitx5/profile

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+[Groups/0]
+# Group Name
+Name=Default
+# Layout
+Default Layout=us
+# Default Input Method
+DefaultIM=mozc
+
+[Groups/0/Items/0]
+# Name
+Name=keyboard-us
+# Layout
+Layout=
+
+[Groups/0/Items/1]
+# Name
+Name=mozc
+# Layout
+Layout=
+
+[GroupOrder]
+0=Default
+