sketch up a possible solution for #66201 (#68642)

src/vs/workbench/browser/media/style.css

@@ -23,6 +23,10 @@
 .monaco-workbench.linux:lang(ja) { font-family: "Ubuntu", "Droid Sans", "Source Han Sans J", "Source Han Sans JP", "Source Han Sans", sans-serif; }
 .monaco-workbench.linux:lang(ko) { font-family: "Ubuntu", "Droid Sans", "Source Han Sans K", "Source Han Sans JR", "Source Han Sans", "UnDotum", "FBaekmuk Gulim", sans-serif; }
 
+.monaco-workbench.mac { --monaco-monospace-font: Monaco, Menlo, Consolas, "Inconsolata", "Courier New", monospace; }
+.monaco-workbench.windows { --monaco-monospace-font: Monaco, Menlo, Consolas, "Inconsolata", "Courier New", monospace; }
+.monaco-workbench.linux { --monaco-monospace-font: Monaco, Menlo, Consolas, "Droid Sans Mono", "Inconsolata", "Courier New", monospace, "Droid Sans Fallback"; }
+
 /* Global Styles */
 
 body {

src/vs/workbench/contrib/comments/electron-browser/media/panel.css

@@ -42,7 +42,7 @@
 }
 
 .comments-panel .comments-panel-container .tree-container .comment-container .text code {
-	font-family: Menlo, Monaco, Consolas, "Droid Sans Mono", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 }
 
 .comments-panel .comments-panel-container .message-box-container {

src/vs/workbench/contrib/debug/browser/media/debug.contribution.css

@@ -139,7 +139,7 @@
 .monaco-workbench .monaco-list-row .expression {
 	overflow: hidden;
 	text-overflow: ellipsis;
-	font-family: Monaco, Menlo, Consolas, "Droid Sans Mono", "Inconsolata", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 }
 
 .monaco-workbench.mac .monaco-list-row .expression {

src/vs/workbench/contrib/debug/browser/media/debugViewlet.css

@@ -296,7 +296,7 @@
 }
 
 .debug-viewlet .debug-watch .monaco-inputbox {
-	font-family: Monaco, Menlo, Consolas, "Droid Sans Mono", "Inconsolata", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 }
 
 .debug-viewlet .monaco-inputbox > .wrapper {

src/vs/workbench/contrib/debug/browser/media/exceptionWidget.css

@@ -19,7 +19,7 @@
 
 .monaco-editor .zone-widget .zone-widget-container.exception-widget .description,
 .monaco-editor .zone-widget .zone-widget-container.exception-widget .stack-trace {
-	font-family: Monaco, Menlo, Consolas, "Droid Sans Mono", "Inconsolata", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 }
 
 .monaco-editor .zone-widget .zone-widget-container.exception-widget .stack-trace {

src/vs/workbench/contrib/debug/browser/media/repl.css

@@ -12,7 +12,7 @@
 }
 
 .repl .surveyor {
-	font-family: Monaco, Menlo, Consolas, "Droid Sans Mono", "Inconsolata", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 	position: absolute;
 	display: inline-block;
 	width : auto;

src/vs/workbench/contrib/extensions/electron-browser/media/extensionEditor.css

@@ -276,7 +276,7 @@
 }
 
 .extension-editor > .body > .content table code:not(:empty) {
-	font-family: Monaco, Menlo, Consolas, "Droid Sans Mono", "Inconsolata", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 	font-size: 90%;
 	background-color: rgba(128, 128, 128, 0.17);
 	border-radius: 4px;

src/vs/workbench/contrib/feedback/electron-browser/media/feedback.css

@@ -128,8 +128,7 @@
 	font-family: inherit;
 	border: 1px solid transparent;
 }
-
-
+																		
 .vs .monaco-workbench .feedback-form .cancel {
 	background: url('close.svg') center center no-repeat;
 }

src/vs/workbench/contrib/preferences/browser/media/keybindingsEditor.css

@@ -167,7 +167,7 @@
 }
 
 .keybindings-editor > .keybindings-body > .keybindings-list-container .monaco-list-row > .column > .code {
-	font-family: Monaco, Menlo, Consolas, "Droid Sans Mono", "Inconsolata", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 	font-size: 90%;
 	opacity: 0.8;
 	display: flex;

src/vs/workbench/contrib/preferences/browser/media/settingsWidgets.css

@@ -16,7 +16,7 @@
 .settings-editor > .settings-body > .settings-tree-container .setting-item.setting-item-exclude .setting-exclude-sibling {
 	display: inline-block;
 	line-height: 22px;
-	font-family: Menlo, Monaco, Consolas, "Droid Sans Mono", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 }
 
 .settings-editor > .settings-body > .settings-tree-container .setting-item.setting-item-exclude .setting-exclude-sibling {

src/vs/workbench/contrib/preferences/electron-browser/media/settingsEditor2.css

@@ -398,7 +398,7 @@
 .settings-editor > .settings-body > .settings-tree-container .setting-item-contents .setting-item-description-markdown code {
 	line-height: 15px;
 	/** For some reason, this is needed, otherwise <code> will take up 20px height */
-	font-family: Menlo, Monaco, Consolas, "Droid Sans Mono", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 }
 
 .settings-editor > .settings-body > .settings-tree-container .setting-item-contents .setting-item-enumDescription {

src/vs/workbench/contrib/welcome/walkThrough/electron-browser/walkThroughPart.css

@@ -98,7 +98,7 @@
 
 .monaco-workbench .part.editor > .content .walkThroughContent code,
 .monaco-workbench .part.editor > .content .walkThroughContent .shortcut {
-	font-family: Menlo, Monaco, Consolas, "Droid Sans Mono", "Courier New", monospace, "Droid Sans Fallback";
+	font-family: var(--monaco-monospace-font);
 	font-size: 14px;
 	line-height: 19px;
 }