feat: add search status label on findbar and replacebar

[Fozei]

desc: 在查找和替换组件上,增加指示当前选中是第几个和总共有多少个查找结果的标签

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Fozei

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[deepin-ci-robot]

Hi @Fozei. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[rb-union]

很好的提交！不过对于大文本下使用遍历的方式有待商榷，有较明显的性能问题。

[deepin-bot[bot]]

TAG Bot

New tag: 6.0.18 DISTRIBUTION: unstable Suggest: synchronizing this PR through rebase #282

[Fozei]

@rb-union Thank you for your reply！确实是这样，我在编码时也考虑到了这一层，但是受制于QT组件本身的限制和个人水平，暂时没有想到更好的办法。在编码时，我甚至参考了VS Code的源码，发现它在至多寻找到19999个出现次数时，就停止再往下查找了。我个人认为，目前我们的编辑器，在加载大文本时，也是有比较明显的性能问题的，所以还是硬着头皮提了这个PR ^_^。希望深度有机会的话，可以把我们的编辑器重构一把哈哈，做成编辑器届的瑞士军刀，小巧而好用，加油！Thanks again ！

[deepin-bot[bot]]

TAG Bot

New tag: 6.5.0 DISTRIBUTION: unstable Suggest: synchronizing this PR through rebase #286

[deepin-bot[bot]]

TAG Bot

New tag: 6.5.1 DISTRIBUTION: unstable Suggest: synchronizing this PR through rebase #289

[deepin-bot[bot]]

TAG Bot

New tag: 6.5.2 DISTRIBUTION: unstable Suggest: synchronizing this PR through rebase #291

[deepin-bot[bot]]

TAG Bot

New tag: 6.5.3 DISTRIBUTION: unstable Suggest: synchronizing this PR through rebase #294