feat: clipboard copying of theme settings

this also removes the stupid state management that every theme setting
had, which I do not remember the justification for but was completely
unnecessary and broke rendering when you update the settings from
outside of these components

src/components/ThemeSettings/UserCSSModal.tsx

@@ -6,9 +6,10 @@
 
 import { useSettings } from "@api/Settings";
 import { Flex } from "@components/Flex";
+import { copyWithToast } from "@utils/misc";
 import { ModalCloseButton, ModalContent, ModalHeader, ModalProps, ModalRoot } from "@utils/modal";
-import { Text } from "@webpack/common";
-import type { ReactNode } from "react";
+import { Button, showToast, Text, Toasts } from "@webpack/common";
+import { type ReactNode } from "react";
 import { UserstyleHeader } from "usercss-meta";
 
 import { SettingBooleanComponent, SettingColorComponent, SettingNumberComponent, SettingRangeComponent, SettingSelectComponent, SettingTextComponent } from "./components";
@@ -107,7 +108,36 @@ export function UserCSSSettingsModal({ modalProps, theme }: UserCSSSettingsModal
                 <ModalCloseButton onClick={modalProps.onClose} />
             </ModalHeader>
             <ModalContent>
-                <Flex flexDirection="column" style={{ gap: 12, marginBottom: 16 }}>{controls}</Flex>
+                <Flex flexDirection="column" style={{ gap: 12, marginBottom: 16 }}>
+                    <div className="vc-settings-usercss-ie-grid">
+                        <Button size={Button.Sizes.SMALL} onClick={() => {
+                            copyWithToast(JSON.stringify(themeSettings), "Copied theme settings to clipboard.");
+                        }}>Export</Button>
+                        <Button size={Button.Sizes.SMALL} onClick={async () => {
+                            const clip = (await navigator.clipboard.read())[0];
+
+                            if (!clip) return showToast("Your clipboard is empty.", Toasts.Type.FAILURE);
+
+                            if (!clip.types.includes("text/plain"))
+                                return showToast("Your clipboard doesn't have valid settings data.", Toasts.Type.FAILURE);
+
+                            try {
+                                var potentialSettings: Record<string, string> =
+                                    JSON.parse(await clip.getType("text/plain").then(b => b.text()));
+                            } catch (e) {
+                                return showToast("Your clipboard doesn't have valid settings data.", Toasts.Type.FAILURE);
+                            }
+
+                            for (const [key, value] of Object.entries(potentialSettings)) {
+                                if (Object.prototype.hasOwnProperty.call(themeSettings, key))
+                                    themeSettings[key] = value;
+                            }
+
+                            showToast("Imported theme settings from clipboard.", Toasts.Type.SUCCESS);
+                        }}>Import</Button>
+                    </div>
+                    {controls}
+                </Flex>
             </ModalContent>
         </ModalRoot>
     );

src/components/ThemeSettings/components/SettingBooleanComponent.tsx

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
-import { Forms, Switch, useState } from "@webpack/common";
+import { Forms, Switch } from "@webpack/common";
 
 interface Props {
     label: string;
@@ -13,13 +13,9 @@ interface Props {
 }
 
 export function SettingBooleanComponent({ label, name, themeSettings }: Props) {
-    const [value, setValue] = useState(themeSettings[name]);
-
     function handleChange(value: boolean) {
         const corrected = value ? "1" : "0";
 
-        setValue(corrected);
-
         themeSettings[name] = corrected;
     }
 
@@ -27,7 +23,7 @@ export function SettingBooleanComponent({ label, name, themeSettings }: Props) {
         <Forms.FormSection>
             <Switch
                 key={name}
-                value={value === "1"}
+                value={themeSettings[name] === "1"}
                 onChange={handleChange}
                 hideBorder
                 style={{ marginBottom: "0.5em" }}

src/components/ThemeSettings/components/SettingColorComponent.tsx

@@ -8,7 +8,7 @@ import "./colorStyles.css";
 
 import { classNameFactory } from "@api/Styles";
 import { findByCodeLazy, findComponentByCodeLazy } from "@webpack";
-import { Forms, useMemo, useState } from "@webpack/common";
+import { Forms, useMemo } from "@webpack/common";
 
 interface ColorPickerProps {
     color: number | null;
@@ -29,17 +29,13 @@ interface Props {
 }
 
 export function SettingColorComponent({ label, name, themeSettings }: Props) {
-    const [value, setValue] = useState(themeSettings[name]);
-
     function handleChange(value: number) {
         const corrected = "#" + (value?.toString(16).padStart(6, "0") ?? "000000");
 
-        setValue(corrected);
-
         themeSettings[name] = corrected;
     }
 
-    const normalizedValue = useMemo(() => parseInt(TinyColor(value).toHex(), 16), [value]);
+    const normalizedValue = useMemo(() => parseInt(TinyColor(themeSettings[name]).toHex(), 16), [themeSettings[name]]);
 
     return (
         <Forms.FormSection>

src/components/ThemeSettings/components/SettingNumberComponent.tsx

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
-import { Forms, TextInput, useState } from "@webpack/common";
+import { Forms, TextInput } from "@webpack/common";
 
 interface Props {
     label: string;
@@ -13,11 +13,7 @@ interface Props {
 }
 
 export function SettingNumberComponent({ label, name, themeSettings }: Props) {
-    const [value, setValue] = useState(themeSettings[name]);
-
     function handleChange(value: string) {
-        setValue(value);
-
         themeSettings[name] = value;
     }
 
@@ -28,7 +24,7 @@ export function SettingNumberComponent({ label, name, themeSettings }: Props) {
                 type="number"
                 pattern="-?[0-9]+"
                 key={name}
-                value={value}
+                value={themeSettings[name]}
                 onChange={handleChange}
             />
         </Forms.FormSection>

src/components/ThemeSettings/components/SettingRangeComponent.tsx

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
-import { Forms, Slider, useMemo, useState } from "@webpack/common";
+import { Forms, Slider, useMemo } from "@webpack/common";
 
 interface Props {
     label: string;
@@ -17,13 +17,9 @@ interface Props {
 }
 
 export function SettingRangeComponent({ label, name, default: def, min, max, step, themeSettings }: Props) {
-    const [value, setValue] = useState(themeSettings[name]);
-
     function handleChange(value: number) {
         const corrected = value.toString();
 
-        setValue(corrected);
-
         themeSettings[name] = corrected;
     }
 
@@ -42,7 +38,7 @@ export function SettingRangeComponent({ label, name, default: def, min, max, ste
         <Forms.FormSection>
             <Forms.FormTitle tag="h5">{label}</Forms.FormTitle>
             <Slider
-                initialValue={parseInt(value, 10)}
+                initialValue={parseInt(themeSettings[name], 10)}
                 defaultValue={def}
                 onValueChange={handleChange}
                 minValue={min}

src/components/ThemeSettings/components/SettingSelectComponent.tsx

@@ -5,7 +5,7 @@
  */
 
 import { identity } from "@utils/misc";
-import { ComponentTypes, Forms, Select, useMemo, useState } from "@webpack/common";
+import { ComponentTypes, Forms, Select, useMemo } from "@webpack/common";
 
 interface Props {
     label: string;
@@ -20,11 +20,7 @@ interface Props {
 }
 
 export function SettingSelectComponent({ label, name, options, default: def, themeSettings }: Props) {
-    const [value, setValue] = useState(themeSettings[name]);
-
     function handleChange(value: string) {
-        setValue(value);
-
         themeSettings[name] = value;
     }
 
@@ -47,7 +43,7 @@ export function SettingSelectComponent({ label, name, options, default: def, the
                 closeOnSelect={true}
 
                 select={handleChange}
-                isSelected={v => v === value}
+                isSelected={v => v === themeSettings[name]}
                 serialize={identity}
             />
         </Forms.FormSection>

src/components/ThemeSettings/components/SettingTextComponent.tsx

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
-import { Forms, TextInput, useState } from "@webpack/common";
+import { Forms, TextInput } from "@webpack/common";
 
 interface Props {
     label: string;
@@ -13,11 +13,7 @@ interface Props {
 }
 
 export function SettingTextComponent({ label, name, themeSettings }: Props) {
-    const [value, setValue] = useState(themeSettings[name]);
-
     function handleChange(value: string) {
-        setValue(value);
-
         themeSettings[name] = value;
     }
 
@@ -26,7 +22,7 @@ export function SettingTextComponent({ label, name, themeSettings }: Props) {
             <Forms.FormTitle tag="h5">{label}</Forms.FormTitle>
             <TextInput
                 key={name}
-                value={value}
+                value={themeSettings[name]}
                 onChange={handleChange}
             />
         </Forms.FormSection>

src/components/ThemeSettings/themesStyles.css

@@ -27,3 +27,9 @@
 .vc-settings-theme-author::before {
     content: "by ";
 }
+
+.vc-settings-usercss-ie-grid {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-gap: 12px; /* matching the flex gap */
+}