Added a checkbox to enable scroll by space

Author: shashank1207

assets/javascripts/app/settings.coffee

@@ -13,6 +13,7 @@ class app.Settings
     'size'
     'tips'
     'autoInstall'
+    'spaceScroll'
   ]
 
   INTERNAL_KEYS = [
@@ -33,6 +34,7 @@ class app.Settings
     schema: 1
     analyticsConsent: false
     theme: 'auto'
+    spaceScroll: 0
 
   constructor: ->
     @store = new CookiesStore

assets/javascripts/app/shortcuts.coffee

@@ -18,6 +18,9 @@ class app.Shortcuts
   swapArrowKeysBehavior: ->
     app.settings.get('arrowScroll')
 
+  spaceScroll: ->
+    app.settings.get('spaceScroll')
+  
   showTip: ->
     app.showTip('KeyNav')
     @showTip = null
@@ -59,7 +62,7 @@ class app.Shortcuts
         @trigger 'escape'
         false
       when 32
-        if event.target.type is 'search' and (not @lastKeypress or @lastKeypress < Date.now() - 3000)
+        if event.target.type is 'search' and @spaceScroll() and (not @lastKeypress or @lastKeypress < Date.now() - 1000)
           @trigger 'pageDown'
           false
       when 33

assets/javascripts/templates/pages/settings_tmpl.coffee

@@ -56,6 +56,9 @@ app.templates.settingsPage = (settings) -> """
         <input type="checkbox" form="settings" name="arrowScroll" value="1"#{if settings.arrowScroll then ' checked' else ''}>Use arrow keys to scroll the main content area
         <small>With this checked, use <code class="_label">shift</code> + <code class="_label">&uarr;</code><code class="_label">&darr;</code><code class="_label">&larr;</code><code class="_label">&rarr;</code> to navigate the sidebar.</small>
       </label>
+      <label class="_settings-label">
+        <input type="checkbox" form="settings" name="spaceScroll" value="1"#{if settings.spaceScroll then ' checked' else ''}>Use spacebar to scroll during search
+      </label>
     </div>
   </div>
 

assets/javascripts/views/content/settings_page.coffee

@@ -16,6 +16,7 @@ class app.views.SettingsPage extends app.View
     settings.arrowScroll = app.settings.get('arrowScroll')
     settings.autoInstall = app.settings.get('autoInstall')
     settings.analyticsConsent = app.settings.get('analyticsConsent')
+    settings.spaceScroll = app.settings.get('spaceScroll')
     settings.autoSupported = app.settings.autoSupported
     settings[layout] = app.settings.hasLayout(layout) for layout in app.settings.LAYOUTS
     settings
@@ -40,6 +41,10 @@ class app.views.SettingsPage extends app.View
     resetAnalytics() unless enable
     return
 
+  toggleSpaceScroll: (enable) ->
+    app.settings.set('spaceScroll', if enable then 1 else 0)
+    return
+
   toggle: (name, enable) ->
     app.settings.set(name, enable)
     return
@@ -85,6 +90,8 @@ class app.views.SettingsPage extends app.View
         @import input.files[0], input
       when 'analyticsConsent'
         @toggleAnalyticsConsent input.checked
+      when 'spaceScroll'
+        @toggleSpaceScroll input.checked
       else
         @toggle input.name, input.checked
     return