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	Fix incorrect "tabindex" attributes (#26733)
Fix #26731 Almost all "tabindex" in code are incorrect. 1. All "input/button" by default are focusable, so no need to use "tabindex=0" 2. All "div/span" by default are not focusable, so no need to use "tabindex=-1" 3. All "dropdown" are focusable by framework, so no need to use "tabindex" 4. Some tabindex values are incorrect (eg: `new_form.tmpl`), so remove them Co-authored-by: Giteabot <teabot@gitea.io>
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		@@ -6,7 +6,6 @@
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      @click.stop="toggleMenu()"
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      :data-tooltip-content="locale.filter_changes_by_commit"
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      aria-haspopup="true"
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      tabindex="0"
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      aria-controls="diff-commit-selector-menu"
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      :aria-label="locale.filter_changes_by_commit"
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      aria-activedescendant="diff-commit-list-show-all"
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@@ -15,7 +14,7 @@
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    </button>
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    <div class="menu left transition" id="diff-commit-selector-menu" :class="{visible: menuVisible}" v-show="menuVisible" v-cloak :aria-expanded="menuVisible ? 'true': 'false'">
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      <div class="loading-indicator is-loading" v-if="isLoading"/>
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      <div v-if="!isLoading" class="vertical item gt-df gt-fc gt-gap-2" id="diff-commit-list-show-all" role="menuitem" tabindex="-1" @keydown.enter="showAllChanges()" @click="showAllChanges()">
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      <div v-if="!isLoading" class="vertical item gt-df gt-fc gt-gap-2" id="diff-commit-list-show-all" role="menuitem" @keydown.enter="showAllChanges()" @click="showAllChanges()">
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        <div class="gt-ellipsis">
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          {{ locale.show_all_commits }}
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        </div>
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@@ -25,7 +24,7 @@
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      </div>
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      <!-- only show the show changes since last review if there is a review AND we are commits ahead of the last review -->
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      <div
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        v-if="lastReviewCommitSha != null" role="menuitem" tabindex="-1"
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        v-if="lastReviewCommitSha != null" role="menuitem"
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        class="vertical item gt-df gt-fc gt-gap-2 gt-border-secondary-top"
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        :class="{disabled: commitsSinceLastReview === 0}"
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        @keydown.enter="changesSinceLastReviewClick()"
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@@ -41,7 +40,7 @@
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      <span v-if="!isLoading" class="info gt-border-secondary-top text light-2">{{ locale.select_commit_hold_shift_for_range }}</span>
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      <template v-for="commit in commits" :key="commit.id">
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        <div
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          class="vertical item gt-df gt-gap-2 gt-border-secondary-top" role="menuitem" tabindex="-1"
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          class="vertical item gt-df gt-gap-2 gt-border-secondary-top" role="menuitem"
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          :class="{selection: commit.selected, hovered: commit.hovered}"
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          @keydown.enter.exact="commitClicked(commit.id)"
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          @keydown.enter.shift.exact="commitClickedShift(commit)"
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