fix wrong colors when editor findMatchForeground is not defined (microsoft#213686)

* fix css

Author: SimonSiefke

src/vs/editor/contrib/find/browser/findWidget.css

@@ -232,21 +232,13 @@
 	background-color: var(--vscode-editor-findMatchHighlightBackground);
 }
 
-.monaco-editor .findMatchInline {
-	color: var(--vscode-editor-findMatchHighlightForeground);
-}
-
 .monaco-editor .currentFindMatch {
 	background-color: var(--vscode-editor-findMatchBackground);
 	border: 2px solid var(--vscode-editor-findMatchBorder);
 	padding: 1px;
 	box-sizing: border-box;
 }
 
-.monaco-editor .currentFindMatchInline {
-	color: var(--vscode-editor-findMatchForeground);
-}
-
 .monaco-editor .findScope {
 	background-color: var(--vscode-editor-findRangeHighlightBackground);
 }

src/vs/editor/contrib/find/browser/findWidget.ts

@@ -35,7 +35,7 @@ import { IContextKey, IContextKeyService } from 'vs/platform/contextkey/common/c
 import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
 import { INotificationService } from 'vs/platform/notification/common/notification';
 import { IStorageService, StorageScope, StorageTarget } from 'vs/platform/storage/common/storage';
-import { asCssVariable, contrastBorder, editorFindMatchHighlightBorder, editorFindRangeHighlightBorder, inputActiveOptionBackground, inputActiveOptionBorder, inputActiveOptionForeground } from 'vs/platform/theme/common/colorRegistry';
+import { asCssVariable, contrastBorder, editorFindMatchForeground, editorFindMatchHighlightBorder, editorFindMatchHighlightForeground, editorFindRangeHighlightBorder, inputActiveOptionBackground, inputActiveOptionBorder, inputActiveOptionForeground } from 'vs/platform/theme/common/colorRegistry';
 import { registerIcon, widgetClose } from 'vs/platform/theme/common/iconRegistry';
 import { IThemeService, registerThemingParticipant } from 'vs/platform/theme/common/themeService';
 import { ThemeIcon } from 'vs/base/common/themables';
@@ -1409,4 +1409,12 @@ registerThemingParticipant((theme, collector) => {
 	if (hcBorder) {
 		collector.addRule(`.monaco-editor .find-widget { border: 1px solid ${hcBorder}; }`);
 	}
+	const findMatchForeground = theme.getColor(editorFindMatchForeground);
+	if (findMatchForeground) {
+		collector.addRule(`.monaco-editor .findMatchInline { color: ${findMatchForeground}; }`);
+	}
+	const findMatchHighlightForeground = theme.getColor(editorFindMatchHighlightForeground);
+	if (findMatchHighlightForeground) {
+		collector.addRule(`.monaco-editor .currentFindMatchInline { color: ${findMatchHighlightForeground}; }`);
+	}
 });