i18n Ivy extractor only reports the first location context

[laurentgoudet]

Small repro in https://github.com/laurentgoudet/ivy-xi18n-bug.

Steps:

• Create a new project & ng add @angular/localize
• Add i18n tags to a couple of tags, one of them being duplicated (https://github.com/laurentgoudet/ivy-xi18n-bug/blob/master/src/app/app.component.html#L343), to simulate the same piece of text being repeated across an application

  <!-- Resources -->
  <h2>Resources</h2>
  <p i18n>Here are some links to help you get started:</p>
  <p i18n>Here are some links to help you get started:</p>

• Run ng xi18n: the dictionary (https://github.com/laurentgoudet/ivy-xi18n-bug/blob/master/messages-ve.xlf) shows all the location references

      <trans-unit id="2b26c7522dda8ad6bc76a0462d7a3c94f0f8a688" datatype="html">
        <source>Here are some links to help you get started:</source>
        <context-group purpose="location">
          <context context-type="sourcefile">src/app/app.component.html</context>
          <context context-type="linenumber">343</context>
        </context-group>
        <context-group purpose="location">
          <context context-type="sourcefile">src/app/app.component.html</context>
          <context context-type="linenumber">344</context>
        </context-group>
      </trans-unit>

• Run ng x18n --ivy: the dictionary (https://github.com/laurentgoudet/ivy-xi18n-bug/blob/master/messages.xlf) only shows the first location reference

      <trans-unit id="2b26c7522dda8ad6bc76a0462d7a3c94f0f8a688" datatype="html">
        <source>Here are some links to help you get started:</source>
        <context-group purpose="location">
          <context context-type="sourcefile">src/app/app.component.html</context>
          <context context-type="linenumber">343</context>
        </context-group>
      </trans-unit>

This means translators have less context to understand how a piece of text is used across an app.

[petebacondarwin]

Thanks for this @laurentgoudet
It is actually a duplicate of #39314
But since you provide an actual reproduction, I will close that and keep this.

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