Poll history - make poll history independent from dialogs (#10349)

* move pollhistory from dialogs to polls directory

* rename PollHistoryDialog -> PollHistory

* rename references to PollHistoryDialog

* move title to PollHistory

* add option to collapse empty dialog header

res/css/_common.pcss

@@ -460,6 +460,11 @@ legend {
     padding-right: 20px; /* leave space for the 'X' cancel button */
 }
 
+.mx_Dialog_header.mx_Dialog_headerWithCancelOnly {
+    padding: 0 20px 0 0;
+    margin: 0;
+}
+
 .mx_Dialog_title.danger {
     color: $alert;
 }

res/css/_components.pcss

@@ -166,8 +166,6 @@
 @import "./views/dialogs/_UserSettingsDialog.pcss";
 @import "./views/dialogs/_VerifyEMailDialog.pcss";
 @import "./views/dialogs/_WidgetCapabilitiesPromptDialog.pcss";
-@import "./views/dialogs/polls/_PollHistoryDialog.pcss";
-@import "./views/dialogs/polls/_PollHistoryList.pcss";
 @import "./views/dialogs/security/_AccessSecretStorageDialog.pcss";
 @import "./views/dialogs/security/_CreateCrossSigningDialog.pcss";
 @import "./views/dialogs/security/_CreateKeyBackupDialog.pcss";
@@ -256,6 +254,8 @@
 @import "./views/messages/_UnknownBody.pcss";
 @import "./views/messages/_ViewSourceEvent.pcss";
 @import "./views/messages/_common_CryptoEvent.pcss";
+@import "./views/polls/pollHistory/_PollHistory.pcss";
+@import "./views/polls/pollHistory/_PollHistoryList.pcss";
 @import "./views/right_panel/_BaseCard.pcss";
 @import "./views/right_panel/_EncryptionInfo.pcss";
 @import "./views/right_panel/_PinnedMessagesCard.pcss";

res/css/views/polls/pollHistory/_PollHistory.pcss

@@ -14,10 +14,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-.mx_PollHistoryDialog_content {
+.mx_PollHistory_content {
     height: 600px;
     width: 100%;
 
     display: flex;
     flex-direction: column;
 }
+
+.mx_PollHistory_header.mx_Heading_h2 {
+    margin-bottom: $spacing-16;
+}