Add indent and unindent actions to RTE

Author: florianduros

src/components/views/rooms/wysiwyg_composer/components/FormattingButtons.tsx

@@ -28,6 +28,8 @@ import { Icon as LinkIcon } from "../../../../../../res/img/element-icons/room/c
 import { Icon as BulletedListIcon } from "../../../../../../res/img/element-icons/room/composer/bulleted_list.svg";
 import { Icon as NumberedListIcon } from "../../../../../../res/img/element-icons/room/composer/numbered_list.svg";
 import { Icon as CodeBlockIcon } from "../../../../../../res/img/element-icons/room/composer/code_block.svg";
+import { Icon as IndentIcon } from "../../../../../../res/img/element-icons/room/composer/indent_increase.svg";
+import { Icon as UnIndentIcon } from "../../../../../../res/img/element-icons/room/composer/indent_decrease.svg";
 import AccessibleTooltipButton from "../../../elements/AccessibleTooltipButton";
 import { Alignment } from "../../../elements/Tooltip";
 import { KeyboardShortcut } from "../../../settings/KeyboardShortcut";
@@ -127,6 +129,18 @@ export function FormattingButtons({ composer, actionStates }: FormattingButtonsP
                 onClick={() => composer.orderedList()}
                 icon={<NumberedListIcon className="mx_FormattingButtons_Icon" />}
             />
+            <Button
+                actionState={actionStates.indent}
+                label={_td("Indent increase")}
+                onClick={() => composer.indent()}
+                icon={<IndentIcon className="mx_FormattingButtons_Icon" />}
+            />
+            <Button
+                actionState={actionStates.unIndent}
+                label={_td("Indent decrease")}
+                onClick={() => composer.unIndent()}
+                icon={<UnIndentIcon className="mx_FormattingButtons_Icon" />}
+            />
             <Button
                 actionState={actionStates.quote}
                 label={_td("Quote")}

test/components/views/rooms/wysiwyg_composer/components/FormattingButtons-test.tsx

@@ -33,6 +33,8 @@ const mockWysiwyg = {
     orderedList: jest.fn(),
     unorderedList: jest.fn(),
     quote: jest.fn(),
+    indent: jest.fn(),
+    unIndent: jest.fn(),
 } as unknown as FormattingFunctions;
 
 const openLinkModalSpy = jest.spyOn(LinkModal, "openLinkModal");
@@ -51,6 +53,8 @@ const testCases: Record<
     orderedList: { label: "Numbered list", mockFormatFn: mockWysiwyg.orderedList },
     unorderedList: { label: "Bulleted list", mockFormatFn: mockWysiwyg.unorderedList },
     quote: { label: "Quote", mockFormatFn: mockWysiwyg.quote },
+    indent: { label: "Indent increase", mockFormatFn: mockWysiwyg.indent },
+    unIndent: { label: "Indent decrease", mockFormatFn: mockWysiwyg.unIndent },
 };
 
 const createActionStates = (state: ActionState): AllActionStates => {