Add Keywords to "Appearance" Preference Page

Add "Icons" and "Titles" as keywords to the preference page so that
user can search for the "Hide Icons" and "Show full Titles" settings.

Fixes: eclipse-platform#2553

Author: BeckerWdf

bundles/org.eclipse.ui.ide/plugin.properties

@@ -233,6 +233,8 @@ PreferenceKeywords.ColorLabels = color label
 PreferenceKeywords.General = click background heap
 PreferenceKeywords.ViewLimit = view limit maximum elements items
 PreferenceKeywords.Themes = themes
+PreferenceKeywords.Icons = icons
+PreferenceKeywords.Titles = titles
 PreferenceKeywords.AppearancePage = presentation MRU dark light tabs
 PreferenceKeywords.Tabs = tab
 PreferenceKeywords.Editors = editors

bundles/org.eclipse.ui.ide/plugin.xml

@@ -461,6 +461,12 @@
       <keyword
             id="org.eclipse.ui.ide.themes"
             label="%PreferenceKeywords.Themes"/>
+      <keyword
+            id="org.eclipse.ui.ide.icons"
+            label="%PreferenceKeywords.Icons"/>
+      <keyword
+            id="org.eclipse.ui.ide.titles"
+            label="%PreferenceKeywords.Titles"/>
       <keyword
             id="org.eclipse.ui.ide.textFont"
             label="%PreferenceKeywords.TextFont"/>
@@ -641,7 +647,9 @@
          <keywordReference id="org.eclipse.ui.ide.appearance"/>
          <keywordReference id="org.eclipse.ui.ide.colorlabels"/>
          <keywordReference id="org.eclipse.ui.ide.themes"/>
+         <keywordReference id="org.eclipse.ui.ide.icons"/>
          <keywordReference id="org.eclipse.ui.ide.tabs"/>
+         <keywordReference id="org.eclipse.ui.ide.titles"/>
          <keywordReference id="org.eclipse.ui.ide.apearancepage"/>
       </page>
       <page