Remove IE11 warning message and related files. Fix #7993

[gianlucadecola]

Referring to #7993 I've removed the warning message related to IE11 and related js code. There are some comments in js referring to IE11, maybe they also can be removed?

wagtail/client/src/components/Draftail/index.js

Line 63 in 52048ba

// document.currentScript is not available in IE11. Use a fallback instead.

wagtail/client/src/components/Draftail/sources/ModalWorkflowSource.js

Line 139 in 52048ba

// IE11 crashes when rendering the new entity in contenteditable if the modal is still open.

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[lb-]

@gianlucadecola thanks heaps for picking this up, I have marked for needs review and triggered the runners.

@thibaudcolas just confirming we are good to do this for 2.17 - I noticed you left these in as part of #7916

[lb-]

@gianlucadecola great stuff! thanks so much for taking the time to contribute this improvement and investigate other issues.

I have pushed to your remote branch with a small change to the docs and also release notes, I have added your name (Gianluca De Cola) to the contributors list. Please let me know if you want the name listed differently.

[lb-]

@gianlucadecola as for the other items you found that are IE11 specific workarounds, it would be amazing if you could pull these out as a separate PR.

From what I can see, these are good to be removed for our next release.

...here are some comments in js referring to IE11, maybe they also can be removed?

wagtail/client/src/components/Draftail/index.js

Line 63 in 52048ba

// document.currentScript is not available in IE11. Use a fallback instead.

wagtail/client/src/components/Draftail/sources/ModalWorkflowSource.js

Line 139 in 52048ba

// IE11 crashes when rendering the new entity in contenteditable if the modal is still open.

[thibaudcolas]

🤘 thank you both! Yes, I can confirm this is good to go for 2.17. Re the other two IE11 workarounds, they technically apply to all browsers. It’d be nice to remove them, as long as we test this enough to make sure the comments are indeed accurate that this is only needed for IE11.