Set "type=button" for editor's toolbar buttons (#26510)
The editor usually is in a form, so the buttons should have "type=button", avoid conflicting with the form's submit.
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			@ -79,6 +79,8 @@ class ComboMarkdownEditor {
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    for (const el of this.textareaMarkdownToolbar.querySelectorAll('.markdown-toolbar-button')) {
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      // upstream bug: The role code is never executed in base MarkdownButtonElement https://github.com/github/markdown-toolbar-element/issues/70
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      el.setAttribute('role', 'button');
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      // the editor usually is in a form, so the buttons should have "type=button", avoiding conflicting with the form's submit.
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      if (el.nodeName === 'BUTTON' && !el.getAttribute('type')) el.setAttribute('type', 'button');
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    }
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    const monospaceButton = this.container.querySelector('.markdown-switch-monospace');
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