Show a warning on editor font overridden by the color scheme

platform/lang-impl/src/com/intellij/application/options/editor/fonts/AppEditorFontConfigurable.java

@@ -55,6 +55,7 @@ public class AppEditorFontConfigurable implements SearchableConfigurable {
 
   @Override
   public boolean isModified() {
+    getFontPanel().getOptionsPanel().updateWarning();
     return !getStoredPreferences().equals(getUIFontPreferences());
   }
 
@@ -75,7 +76,9 @@ public class AppEditorFontConfigurable implements SearchableConfigurable {
   @Override
   public void reset() {
     getStoredPreferences().copyTo(getUIFontPreferences());
-    getFontPanel().getOptionsPanel().updateOptionsList();
+    AppEditorFontOptionsPanel optionsPanel = getFontPanel().getOptionsPanel();
+    optionsPanel.updateWarning();
+    optionsPanel.updateOptionsList();
   }
 
   @NotNull

platform/lang-impl/src/com/intellij/application/options/editor/fonts/AppEditorFontOptionsPanel.java

@@ -16,18 +16,73 @@
 package com.intellij.application.options.editor.fonts;
 
 import com.intellij.application.options.colors.AbstractFontOptionsPanel;
+import com.intellij.application.options.colors.ColorAndFontOptions;
+import com.intellij.icons.AllIcons;
+import com.intellij.ide.DataManager;
+import com.intellij.openapi.application.ApplicationBundle;
+import com.intellij.openapi.editor.colors.EditorColorsManager;
 import com.intellij.openapi.editor.colors.EditorColorsScheme;
 import com.intellij.openapi.editor.colors.FontPreferences;
+import com.intellij.openapi.options.Configurable;
+import com.intellij.openapi.options.ex.Settings;
+import com.intellij.ui.HoverHyperlinkLabel;
+import com.intellij.ui.JBColor;
+import com.intellij.util.ui.JBUI;
 import org.jetbrains.annotations.NotNull;
 
+import javax.swing.*;
+import javax.swing.event.HyperlinkEvent;
+import javax.swing.event.HyperlinkListener;
+import java.awt.*;
+
 public class AppEditorFontOptionsPanel extends AbstractFontOptionsPanel {
   private final EditorColorsScheme myScheme;
+  private JPanel myWarningPanel;
+  private JLabel myEditorFontLabel;
 
   protected AppEditorFontOptionsPanel(EditorColorsScheme scheme) {
     myScheme = scheme;
     updateOptionsList();
   }
 
+  @Override
+  protected JComponent createControls() {
+    JPanel topPanel = new JPanel(new GridBagLayout());
+    GridBagConstraints c = new GridBagConstraints();
+    c.insets = JBUI.emptyInsets();
+    c.gridx = 0;
+    c.gridy = 0;
+    c.anchor = GridBagConstraints.WEST;
+    myWarningPanel = createMessagePanel();
+    topPanel.add(myWarningPanel, c);
+    c.gridy = 1;
+    topPanel.add(createFontSettingsPanel(), c);
+    return topPanel;
+  }
+
+  private JPanel createMessagePanel() {
+    JPanel messagePanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
+    messagePanel.add(new JLabel(AllIcons.General.BalloonWarning));
+    myEditorFontLabel = createHyperlinkLabel();
+    messagePanel.add(myEditorFontLabel);
+    JLabel commentLabel = new JLabel(ApplicationBundle.message("settings.editor.font.defined.in.color.scheme.message"));
+    commentLabel.setForeground(JBColor.GRAY);
+    messagePanel.add(commentLabel);
+    return messagePanel;
+  }
+
+  public void updateWarning() {
+    EditorColorsScheme scheme = EditorColorsManager.getInstance().getGlobalScheme();
+    if (!scheme.isUseAppFontPreferencesInEditor()) {
+      myEditorFontLabel.setText(
+        ApplicationBundle.message("settings.editor.font.overridden.message", scheme.getEditorFontName(), scheme.getEditorFontSize()));
+      myWarningPanel.setVisible(true);
+    }
+    else {
+      myWarningPanel.setVisible(false);
+    }
+  }
+
   @Override
   protected boolean isReadOnly() {
     return false;
@@ -58,4 +113,32 @@ public class AppEditorFontOptionsPanel extends AbstractFontOptionsPanel {
   protected void setCurrentLineSpacing(float lineSpacing) {
     myScheme.setLineSpacing(lineSpacing);
   }
+
+  @NotNull
+  private JLabel createHyperlinkLabel() {
+    HoverHyperlinkLabel label = new HoverHyperlinkLabel("");
+    label.addHyperlinkListener(new HyperlinkListener() {
+      @Override
+      public void hyperlinkUpdate(HyperlinkEvent e) {
+        if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
+          navigateToColorSchemeFontConfigurable();
+        }
+      }
+    });
+    return label;
+  }
+
+  protected void navigateToColorSchemeFontConfigurable() {
+    Settings allSettings = Settings.KEY.getData(DataManager.getInstance().getDataContext(getPanel()));
+    if (allSettings != null) {
+      final Configurable colorSchemeConfigurable = allSettings.find(ColorAndFontOptions.ID);
+      if (colorSchemeConfigurable instanceof ColorAndFontOptions) {
+        Configurable fontOptions =
+          ((ColorAndFontOptions)colorSchemeConfigurable).findSubConfigurable(ColorAndFontOptions.FONT_CONFIGURABLE_NAME);
+        if (fontOptions != null) {
+          allSettings.select(fontOptions);
+        }
+      }
+    }
+  }
 }

platform/platform-resources-en/src/messages/ApplicationBundle.properties

@@ -549,6 +549,8 @@ secondary.font=Fallback font:
 use.ligatures=Enable font ligatures
 ligatures.jre.warning=<html>The JRE you are running {0} with<br>is known to have performance issues<br>related to ligatures support.<br>Use <a href="https://confluence.jetbrains.com/display/IDEADEV/JetBrains+Runtime+Environment">JetBrains Runtime</a> instead to enable ligatures.
 settings.editor.font.none=<None>
+settings.editor.font.overridden.message=Current editor font: {0}, {1}
+settings.editor.font.defined.in.color.scheme.message= \u2014 defined in the color scheme
 editbox.enter.tag.name=Enter tag name:
 title.tag.name=Tag Name
 title.xml=XML