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	Fix sticky header in diff view (#23554)
Ressurection of #23549. Fix regression https://github.com/go-gitea/gitea/pull/23513#issuecomment-1474356817 from #23271. The previous sticky CSS did assume the content is always 2 rows, but since that PR, it's single-row above 993px width. Adjust the sticky offset to match and add a small tweak that hides content behind the `border-radius`. Single row: <img width="1264" alt="Screenshot 2023-03-17 at 21 33 05" src="https://user-images.githubusercontent.com/115237/226034050-a04b131d-fd3f-45c0-bc72-413738a59825.png"> Double row: <img width="1243" alt="Screenshot 2023-03-17 at 21 32 53" src="https://user-images.githubusercontent.com/115237/226034163-2f1c6aa9-fc72-432f-bc46-9a7119da8677.png">
This commit is contained in:
		@@ -1615,12 +1615,14 @@
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  padding: 7px 0;
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					  padding: 7px 0;
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  background: var(--color-body);
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					  background: var(--color-body);
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  line-height: 30px;
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					  line-height: 30px;
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					  height: 47px; /* match .ui.attached.header.diff-file-header.sticky-2nd-row */
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}
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					}
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@media (max-width: 991px) {
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					@media (max-width: 991px) {
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  .repository .diff-detail-box {
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					  .repository .diff-detail-box {
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    flex-direction: column;
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					    flex-direction: column;
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    align-items: flex-start;
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					    align-items: flex-start;
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					    height: 77px; /* match .ui.attached.header.diff-file-header.sticky-2nd-row */
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  }
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					  }
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}
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					}
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@@ -1634,7 +1636,7 @@
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  position: sticky;
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					  position: sticky;
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  top: 0;
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					  top: 0;
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  z-index: 8;
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					  z-index: 8;
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  border-bottom: 1px solid var(--color-secondary);
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					  border-bottom: none;
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  padding-left: 2px;
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					  padding-left: 2px;
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  padding-right: 2px;
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					  padding-right: 2px;
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  margin-left: -1px;
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					  margin-left: -1px;
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@@ -3322,10 +3324,16 @@ td.blob-excerpt {
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.ui.attached.header.diff-file-header.sticky-2nd-row {
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					.ui.attached.header.diff-file-header.sticky-2nd-row {
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  position: sticky;
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					  position: sticky;
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  top: 77px;
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					  top: 47px; /* match .repository .diff-detail-box */
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  z-index: 7;
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					  z-index: 7;
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}
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					}
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					@media (max-width: 991px) {
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					  .ui.attached.header.diff-file-header.sticky-2nd-row {
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					    top: 77px; /* match .repository .diff-detail-box */
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					  }
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					}
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@media (max-width: 480px) {
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					@media (max-width: 480px) {
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  .ui.attached.header.diff-file-header.sticky-2nd-row {
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					  .ui.attached.header.diff-file-header.sticky-2nd-row {
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    position: static;
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					    position: static;
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