Some Colors and Fonts entries already provide user facing descriptions

via ThemeElementCategory, while others do not.
This change uses the existing descriptions to display in the description
box and adds description for ones that doesn't have any entries to
ensure the description area is not left empty and that available
descriptions are consistently utilised.
This aligns with the standard usage elsewhere in Eclipse preference
pages.

The main change pertaining to this has been merged in
eclipse.platform.ui via
eclipse-platform/eclipse.platform.ui#3666
and the remaining part is addressed via this change.

Author: elsazac

debug/org.eclipse.debug.ui/plugin.properties

@@ -213,6 +213,8 @@ ActionDefinition.toggleStepFilters.description= Toggles enablement of debug step
 ActionDefinition.stepInto.name= Step Into
 ActionDefinition.stepInto.description= Step into
 
+org.eclipse.debug.ui.presentation.description = Colors and fonts used for debug sessions, breakpoints and variables.
+
 ActionDefinition.stepOver.name= Step Over
 ActionDefinition.stepOver.description= Step over
 

debug/org.eclipse.debug.ui/plugin.xml

@@ -2995,9 +2995,12 @@ M4 = Platform-specific fourth key
            perspectiveId="org.eclipse.debug.ui.DebugPerspective"/>
   </extension>
 
-   <extension
-         point="org.eclipse.ui.themes">
-		<themeElementCategory label="%debugPresentation.label" id="org.eclipse.debug.ui.presentation"/>
+	<extension point="org.eclipse.ui.themes">
+		<themeElementCategory id="org.eclipse.debug.ui.presentation" label="%debugPresentation.label">
+			<description>
+				%org.eclipse.debug.ui.presentation.description
+			</description>
+		</themeElementCategory>
       <fontDefinition
             label="%DetailPaneFontDefinition.label"
             defaultsTo="org.eclipse.jface.textfont"

team/bundles/org.eclipse.compare/plugin.properties

@@ -1,5 +1,5 @@
 ###############################################################################
-# Copyright (c) 2000, 2025 IBM Corporation and others.
+# Copyright (c) 2000, 2026 IBM Corporation and others.
 #
 # This program and the accompanying materials
 # are made available under the terms of the Eclipse Public License 2.0
@@ -167,6 +167,8 @@ ComparePreferencePage.colorAndFontLink=See <a>''{0}''</a> preferences for text c
 
 textCompareAppearance.label=Text Compare
 
+org.eclipse.compare.contentmergeviewer.TextMergeViewer=Colors and fonts used in compare editors to indicate differences, conflicts, and changes.
+
 compareIncomingColor.label= Incoming change color
 compareIncomingColor.description= The color used to indicate an incoming change in compare and merge tools.
 compareOutgoingColor.label= Outgoing change color

team/bundles/org.eclipse.compare/plugin.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.0"?>
 <!--
-    Copyright (c) 2001, 2019 IBM Corporation and others.
+    Copyright (c) 2001, 2026 IBM Corporation and others.
 
     This program and the accompanying materials
     are made available under the terms of the Eclipse Public License 2.0
@@ -30,6 +30,9 @@
       <themeElementCategory
             label="%textCompareAppearance.label"
             id="org.eclipse.compare.contentmergeviewer.TextMergeViewer">
+         <description>
+            %org.eclipse.compare.contentmergeviewer.TextMergeViewer
+         </description>
       </themeElementCategory>
       <colorDefinition
             label="%compareIncomingColor.label"