This is an IDEA plugin designed to set the code as read-only when we are reading source code downloaded from the internet, preventing accidental modifications caused by inadvertent keyboard touches.
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download from jetbarin plugin market or Github repository
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install the plugin
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Jetbrains GUI's tools -> Set All Files to Read-only / Set All files To Writeable
The plugin has already been uploaded to the JetBrains Plugin Marketplace. You can find it at this link.