Merge pull request #1979 from nextcloud/backport/1971/stable3

[stable3] Add timestamp tooltip

src/components/AppSidebar/AppSidebar.vue

@@ -208,7 +208,10 @@ include a standard-header like it's used by the files app.
 								</form>
 							</template>
 							<!-- secondary title -->
-							<p v-if="subtitle.trim() !== ''" class="app-sidebar-header__subtitle">
+							<p
+								v-if="subtitle.trim() !== ''"
+								v-tooltip.auto="subtitleTooltip"
+								class="app-sidebar-header__subtitle">
 								{{ subtitle }}
 							</p>
 						</div>
@@ -288,6 +291,10 @@ export default {
 			type: String,
 			default: '',
 		},
+		subtitleTooltip: {
+			type: String,
+			default: '',
+		},
 
 		/**
 		 * Url to the top header background image