Merge #5885

5885: Make inlay hints colors more configurable r=matklad a=Veetaha

**[BREAKING CHANGE]**

Tackles https://github.com/rust-analyzer/rust-analyzer/issues/5337#issuecomment-680018601 and generally related to #5337.

Added `foreground/background` color configurations with optional more specific overrides `foreground.(type|parameter|chaining)Hints`.

One problem I see is that the config keys are long and don't fit into the on-hover hints in the `settings.json` file entirely...

<details>
<summary>Demo</summary>

![demo](https://user-images.githubusercontent.com/36276403/91238334-77fc3b00-e745-11ea-836b-2822015ece98.gif)

</details>

Co-authored-by: Veetaha <[email protected]>

1 files changed, 65 insertions, 2 deletions

diff --git a/editors/code/package.json b/editors/code/package.json
index f079f73b8..93d94ed12 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -712,8 +712,8 @@
         ],
         "colors": [
             {
-                "id": "rust_analyzer.inlayHint",
-                "description": "Color for inlay hints",
+                "id": "rust_analyzer.inlayHints.foreground",
+                "description": "Foreground color of inlay hints (is overriden by more specific rust_analyzer.inlayHints.foreground.* configurations)",
                 "defaults": {
                     "dark": "#A0A0A0F0",
                     "light": "#747474",
@@ -721,6 +721,69 @@
                 }
             },
             {
+                "id": "rust_analyzer.inlayHints.background",
+                "description": "Background color of inlay hints (is overriden by more specific rust_analyzer.inlayHints.background.* configurations)",
+                "defaults": {
+                    "dark": "#11223300",
+                    "light": "#11223300",
+                    "highContrast": "#11223300"
+                }
+            },
+            {
+                "id": "rust_analyzer.inlayHints.foreground.typeHints",
+                "description": "Foreground color of inlay type hints for variables (overrides rust_analyzer.inlayHints.foreground)",
+                "defaults": {
+                    "dark": "rust_analyzer.inlayHints.foreground",
+                    "light": "rust_analyzer.inlayHints.foreground",
+                    "highContrast": "rust_analyzer.inlayHints.foreground"
+                }
+            },
+            {
+                "id": "rust_analyzer.inlayHints.foreground.chainingHints",
+                "description": "Foreground color of inlay type hints for method chains (overrides rust_analyzer.inlayHints.foreground)",
+                "defaults": {
+                    "dark": "rust_analyzer.inlayHints.foreground",
+                    "light": "rust_analyzer.inlayHints.foreground",
+                    "highContrast": "rust_analyzer.inlayHints.foreground"
+                }
+            },
+            {
+                "id": "rust_analyzer.inlayHints.foreground.parameterHints",
+                "description": "Foreground color of function parameter name inlay hints at the call site (overrides rust_analyzer.inlayHints.foreground)",
+                "defaults": {
+                    "dark": "rust_analyzer.inlayHints.foreground",
+                    "light": "rust_analyzer.inlayHints.foreground",
+                    "highContrast": "rust_analyzer.inlayHints.foreground"
+                }
+            },
+            {
+                "id": "rust_analyzer.inlayHints.background.typeHints",
+                "description": "Background color of inlay type hints for variables (overrides rust_analyzer.inlayHints.background)",
+                "defaults": {
+                    "dark": "rust_analyzer.inlayHints.background",
+                    "light": "rust_analyzer.inlayHints.background",
+                    "highContrast": "rust_analyzer.inlayHints.background"
+                }
+            },
+            {
+                "id": "rust_analyzer.inlayHints.background.chainingHints",
+                "description": "Background color of inlay type hints for method chains (overrides rust_analyzer.inlayHints.background)",
+                "defaults": {
+                    "dark": "rust_analyzer.inlayHints.background",
+                    "light": "rust_analyzer.inlayHints.background",
+                    "highContrast": "rust_analyzer.inlayHints.background"
+                }
+            },
+            {
+                "id": "rust_analyzer.inlayHints.background.parameterHints",
+                "description": "Background color of function parameter name inlay hints at the call site (overrides rust_analyzer.inlayHints.background)",
+                "defaults": {
+                    "dark": "rust_analyzer.inlayHints.background",
+                    "light": "rust_analyzer.inlayHints.background",
+                    "highContrast": "rust_analyzer.inlayHints.background"
+                }
+            },
+            {
                 "id": "rust_analyzer.syntaxTreeBorder",
                 "description": "Color of the border displayed in the Rust source code for the selected syntax node (see \"Show Syntax Tree\" command)",
                 "defaults": {