sessions: clarify responsive diff accessibility

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: sandy081

src/vs/sessions/contrib/changes/browser/changesViewActions.ts

@@ -333,7 +333,7 @@ MenuRegistry.appendMenuItem(Menus.SessionsEditorHeaderSecondary, {
 	command: {
 		id: TOGGLE_DIFF_SIDE_BY_SIDE,
 		title: localize('preferSideBySideDiff', "Prefer Side by Side Diff"),
-		tooltip: localize('preferSideBySideDiff.tooltip', "Uses side-by-side layout when space allows."),
+		tooltip: localize('preferSideBySideDiff.tooltip', "Uses inline layout when space is limited unless screen reader optimized mode is enabled."),
 		icon: Codicon.diffSidebyside,
 		toggled: {
 			condition: ContextKeyExpr.or(

src/vs/sessions/contrib/changes/browser/sessionsChangesAccessibilityHelp.ts

@@ -35,7 +35,7 @@ export class SessionsChangesAccessibilityHelp implements IAccessibleViewImplemen
 		content.push(localize('sessionsChanges.checks', "The Checks section lists the continuous integration checks for the session's pull request. Its header is a button: press Enter or Space to collapse or expand it{0}.", '<keybinding:sessions.action.revealCIChecks>'));
 		content.push(localize('sessionsChanges.viewMode', "The Changes view can show files as a tree or a flat list. Use the view's toolbar actions to switch between Tree and List modes."));
 		content.push(localize('sessionsChanges.operations', "When available, the toolbar also provides actions to commit, merge, sync, or create a pull request. Use Tab and Shift+Tab to move between the file list and toolbar actions."));
-		content.push(localize('sessionsChanges.diffView', "File diffs can prefer side-by-side or inline layout. Side-by-side diffs automatically use inline layout when space is limited. Use the Toggle Preferred Diff View command to switch the preference{0}.", '<keybinding:toggle.diff.renderSideBySide>'));
+		content.push(localize('sessionsChanges.diffView', "File diffs can prefer side-by-side or inline layout. Unless screen reader optimized mode is enabled, side-by-side diffs automatically use inline layout when space is limited. Use the Toggle Preferred Diff View command to switch the preference{0}.", '<keybinding:toggle.diff.renderSideBySide>'));
 
 		return new AccessibleContentProvider(
 			AccessibleViewProviderId.SessionsChanges,

src/vs/sessions/contrib/changes/test/browser/changesViewActions.test.ts

@@ -194,7 +194,7 @@ suite('Changes View Actions', () => {
 			group: '1_diff',
 			order: 20,
 			icon: Codicon.diffSidebyside.id,
-			tooltip: 'Uses side-by-side layout when space allows.',
+			tooltip: 'Uses inline layout when space is limited unless screen reader optimized mode is enabled.',
 			toggledTitle: 'Prefer Inline Diff',
 			toggledTooltip: 'Always uses inline layout.',
 			toggledOnSharedPreference: true,