The ContentType implementation of IContentType.isAssociatedWith is case insensitive and I find no case sensitive alternative

The ContentType implementation of IContentType.isAssociatedWith is case insensitive which means that if your content type contains .c and the presented file is a .C file ContentType.isAssociatedWith will return true.

There are 2 locations where ContentType.isAssociatedWith uses equalsIgnoreCase
https://github.com/eclipse-platform/eclipse.platform/blob/f385650ab42fb7275ab164643fe2d1db5040750e/runtime/bundles/org.eclipse.core.contenttype/src/org/eclipse/core/internal/content/FileSpec.java#L53
and
https://github.com/eclipse-platform/eclipse.platform/blob/f385650ab42fb7275ab164643fe2d1db5040750e/runtime/bundles/org.eclipse.core.contenttype/src/org/eclipse/core/internal/content/ContentType.java#L385

Unfortunately for me .c files are associated with c compilers and .C files are associated with C++ compilers which means CDT can not use ContentType.isAssociatedWith and chose to implemented a private method to provide the functionality.
https://github.com/eclipse-cdt/cdt/blob/7c8bb9f00ef0d5e3ff493bc0c944519a3e476da2/core/org.eclipse.cdt.core/src/org/eclipse/cdt/internal/core/CContentTypes.java#L130

As I need a case sensitive implementation of IContentType.isAssociatedWith I have the option to make the private method of CDT public or have a solution in (I)ContentType.
I'd prefer the second.

Note 1) I did not find any documentation that says the comparison is case insensitive.
Note 2) I think file name comparison is case insensitive as well.
Note 3) I can create a PR but I need some guidance on what the change should look like.

まず runtime/bundles/org.eclipse.core.contenttype/src/org/eclipse/core/internal/content/FileSpec.java と ContentType.java にある equalsIgnoreCase の使用箇所を読み、次に CDT の CContentTypes.java にある大文字と小文字を区別するロジックと比較します。完了条件は、コンテンツタイプ API が、CDT のプライベートな回避策を必要とせず、文書化された大文字と小文字を区別する関連付けパスを提供することです。

索引モデルが issue の本文から書いたものです。