See this SO post: https://stackoverflow.com/questions/49557737/should-i-add-idea-caches-build-file-checksums-ser-to-gitignore

and this Google issue tracker ticket: https://issuetracker.google.com/issues/77544553

for justification.

If checked the option "Always create backup copy" under Settings -> Save within Microsoft Word 2016 on macOS, when editing a docx file, a folder named as same as docx file name(without ext) will be created and placed a docx backup file named "Backup of DOCX_ORIGINAL_FILENAME.docx".

contentModel.xml is automatically generated and can be safely ignored.

Source: https://rider-support.jetbrains.com/hc/en-us/community/posts/115000661950-A-lot-of-files-in-contentModel-xml?page=1#community_comment_115000538984

Add extra commented section to use when using Gradle or Maven auto-import.
These are mentioned in the original reference for optional excludes (https://intellij-support.jetbrains.com/hc/en-us/articles/206544839).
If this would be better as a separate, non-commented ignore file, let me know and I will resubmit.

.idea/misc.xml used to contain usage statistics.  This was broken out to usage.statistics.xml in the latest EAP (2018.2 EAP).  It should be excluded from git.

See https://youtrack.jetbrains.com/issue/IDEA-192913

ignore dbnavigator.xml

because it contains sensitive data, such as host, port, db, user name, and so on.

Microsoft was announced a new extension of installer for Windows. I just added that one to be ignored as default, like others installers files.
References:
https://blogs.windows.com/buildingapps/2018/03/07/three-things-need-know-windows-developer-day/
https://github.com/Microsoft/msix-packaging

This directory used by HTTP Client in IntelliJ IDEA (and other product).
https://www.jetbrains.com/help/idea/http-client-in-product-code-editor.html#viewingResponse

Since IDEA 14 (2014), IDEA and other contemporaneous JebBrains IDEs don't store sensitive info in `datasources.xml` and it makes sense to version control to share project data sources among the team. `dataSources.local.xml` is user-specific: contain usernames and could be sensitive from a security perspective, albeit passwords could be externalized to e.g. Mac Keychain.

References: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839, https://youtrack.jetbrains.com/issue/IDEA-127105

On line 1, WebStorm is capitalized the same way as the other IDE names.

* Update Eclipse.gitignore

* Update Eclipse.gitignore

Added extensions for prepackaged app and toolbox file, pregenerated helpsearch folders.

`.autosave` does not match the name of autosave file generated by
simulink. A leading asterisk(*) is needed to match such name.

- Ignore all cmake build directories, not just debug.

**Reasons for making this change:**

Ignore the stack dump generated when a program has crashed under Windows.

**Links to documentation supporting these rule changes:** 

http://www.drupalonwindows.com/en/blog/git-shell-windows-reports-shexe-has-stopped-working-appcrash
https://community.atlassian.com/t5/SourceTree-questions/Sourcetree-cannot-clone-pull-anymore-sh-exe-stackdump/qaq-p/82962